The Brainwavz M1 is a sub 50$ sold by MP4Nation that is marketed as having a wide soundstage and accurate sound.
I think that is half true, but must compliment Brainwavz on what they get out of an iem at this price. In short, this
is a very musical and enjoyable headphone that is not fatiguing and makes you want to continue to listen to music
of all genres because it enlivens you.
 
This dynamic driver phone has a newly redesigned oxygen free cable that is silver plated, which seems to give it a
lively and dynamic sound which is accurate and punchy. The soundstage is large, but not really wide, and its fine.
The tones of the bass, midrange and treble are tuned very very well and very balanced.  So your brain relaxes into
the gestalt of the whole musical experience.  
 
Not as much detail here as in the S5s by Brainwavz, but at a substantially lower cost  these phones are a great value
A very good intro phone for someone new to hi fi iems , as all rounder for going out and about, these phones are
worthy. I have more expensive phones that are much more finicky and hard to fit, with the comply tips enclosed
these get a great seal which contributes to the overall balanced goodness.
 
If one has almost twice the price of these to spend, the S5 occupy as high niche in the ecology of sound from iems.
they are truly very good,  deep and full of detail.  But if  cost is an issue, the M1s are a deserving choice that you
well be able to live with and enjoy fully. A keeper.  Note: the cost has plunged below 40$ on Amazon.com, making them
an even better value!

Thanks to Audrey at Brainwavz for this opportunity to review the new Brainwavz S0.  I am not affiliated
in any way to Brainwavz, although i did review the S5 recently with a review sample from them.
 
The S0 is the so called "baby brother" to the recently released S5 from Brainwavz and is a welcome
addition to the Brainwavz family of inexpensive IEMs.  It is smaller than its bigger brother and actually
had a better fit for me with its on board tips, with a good seal and is remarkably comfortable.  Still made
of metal at 50$ it is well built and has a good selection of alternate tips and supplies with it and a case.
 
Brainwavz advertises the S0s as having a "clear balanced sound" and after burn in they pretty much do
although there is still a mid bass hump to them but its pleasant for most music. The cable has good strain
relief and was pretty tangle proof. The design is straightforward and fairly simple, with neodymium magnets
and aluminum housing, and they seem well made and fell good in your hands and ears.
 
The out of the box sound changed a fair amount with 100 or so hours of burn in, which tamed the
initial bloated bass and sibilence and rounded the sound to a fairly balanced presentation.  the bass
is still humped, but less so than the S5, and after burn in the S0 is pleasant for a variety of music from
blues to EDM  through rock.  More lyrical wavy or ambient music sounds more digital than one might like
but the phone does nice things to streaming audio and makes it pleasant to listen to in a good way.
 
Overall the sound quality is that of a decent car radio--pleasant for background non critical listening
good to do work or chores to, or while watching sports or news you don't want to hear the sound to
and prefer music to.  I don't say this as a criticism:  a good car stereo is a major achievement!  i once
had a contest with a doctor friend who won the contest after putting 14 speakers, six amps and
four subwoofers in his old cadillac...and thousands of dollars. his car was a rolling boom box!
Well this S0 is not THAT kind of car stereo, but it is pleasant
light weight IEM that is fund to "cruise around " with while one is doing other things.  It sounds very
good out of my HTC one M8 without an amp, and stays put in my ears while i do other things with
good sound isolation.
 
This phone is a welcome addition to the Brainwavz lineup.  Some folks, indeed,  might prefer its smoother rounded
sound to the S5.  Its not pretending to be anything its not or trying to out muscle more expensive
IEMs and is worth the 50 dollars I believe.  At the same time there are more exotic earphones
like the Zero Audio Tenore which have a smoother midrange and vocal presentation that is magical
at the same price range. (not up to the bass of the S0 however, so as Mark Twain says "you pays your
money and you takes your choice"  And for forty nine  dollars more you can upgrade to the new Fidue A71 which
has three drivers and sounds super LIVE, not like a car radio.
 
But for an entry level IEM that transcends the basic Phillips,Sony, and assorted Chinese cheap phones available,
and such it outperforms the 20-30$ mass market phones by quite a bit! And so it becomes
a very good pocket companion to me, stashed in my jacket in case i want to tune in and out
of the default realities with streaming audio like JohnnyBlue on Soundcloud, or such, or
relax with my amazon cloud library on the go...it works just fine and is quite listenable for these.
 
I think this phone would make a great holiday present for newbies into portable audio and everyday companion
for those with good smartphone sound on the go.......

Thanks to Brainwavz for a review sample of the S5 headphone, which by now has 38 reviews posted on this site, quite a lot.
I won't repeat all the information that is available here on the design implementation packaging etc of these phones, since
it is all repeated over and over again here.  I will start with my conclusions:
 
This is a very good iem for carrying around in your pocket with your phone or iPad for portable listening to streaming
music, especially EDM, electronica and blues.  In fact, i would give Kudos to Brainwavz for making a product in this
price range (100$ or so) that maximizes the sq of the streams that come out of portable devices connected to the internet.
This phone makes listening to amazon music, Pandora, etc more delightful than phones like the ue600, zero audio singlulo,
etc because its tuned to making listening to streams a pleasure instead of an inditement of poor internet sound quality of audio.
 
Brainwavz created a fairly balanced spectrum of sound in the S5, while emphasizing the bass .  This emphasis makes these
phones especially potent for EDM and rock, but less so for other types of music.  The midrange is clear and the 
treble is fairly sparkly, but both of the above lack detail and clarity because of the bass emphasis.  This is typical of phones
in this price range, however, and the S5 is still quite enjoyable in spite of this. 
 
Where it breaks down is listening to more refined source material, trying to improve the sound through amping
through state of the art device like the Cayin C5, or through high resolution players like the DX90. for those sources you
want to go beyond the qualities of the S5 to a more refined phone line the Doppios or FX850s, which are of course, a lot
more expensive.  But those phones aren't needed when listening to streaming audio directly out of
your pocket on a smartphone or iPad. However, it should be noted that DSnuts, in his review, found the S5
did respond with improved quality to amplification and better power sources (ifi Usb )
 
The S5 fills a niche with aplomb here, being good enough to really enjoy
for example, psytrance on sound cloud (Jonny Blue mixes on peak records), Robert Plant on iTunes radio, or other
sounds of the moment that you can hear for free.  True, they don't have all the detail you want want, and the bass
is rather overemphasized, but so what?  the overall sound is enjoyable, musical and you can
close your eyes and dream with the music, or water your garden while listening and dancing to the beat. i would agree
mostly with Kamakaha's conclusions in his recent review of the S5:
 
"The Brainwavz S5 offers a trade off of benefits and flaws. It doesn't match up well with my personal preferences. I could see myself using these as a benchmark for separation with the right tips. In fact, it almost felt like the music's tempo slowed and allowed me a matrix style glimpse and otherwise extremely fast sequences. The sparkle is a friendly and welcome addition to the sound, even with the occasional peaky regions. Unfortunately, the dryish mids, loose bass and lack of depth make me reconsider their place in my line up. 
I feel like there is a lot of competition in the $40-100 earphone catagory. I feel like the S5 might have a difficult time standing out among the crowd. 
In the future I'd like to see a tuning that tightens up the bass and reduces the upper-mid treble peak. I think that would help bring the overall timbre, especially the mids."
 
But sometimes average is good enough, and the marriage of convenience of live free sound streams, and the Brainwavz S5
is a good one for such listening!  I'm enjoying these every day! I think these do stand out for the uses i recommend.
When i reach for my DX90, FLAC recordings or critical listening sessions, i switch to other phones, but that leaves me
a lot of time when i am happy to have the S5s in my pocket with my phone and reach for them!!!