First off, I should clarify that I own a number of V-Moda gear, including IEMs, on-ear, over-ear and cables.  I have found that their customer service is really outstanding and if you buy a number of different headphones, you know how important this is.  I own gear from other manufacturers, including Westone, Audio-Technica, Klipsch, Etamonics and at one point or another, I have had service issues that may require several calls or emails.  Not with V-Moda, they get me from my first contact and everything flows just as smoothly from there.
 
On to the Crossfades M-100, here are a few thoughts:
*     Excellent sound presentation, with bass being a little forward but not overly dominant.
*     Very easy to drive and sound great without an DAC/Amp and modulate well with EQ settings
*     Non-tangle cord, which is wrapped in cloth to insure microphonics and are comfortable when rubbing against you as you move around.
*     Comes with "dual" splitter cord that allows you to plug two headphones into one source.
*     Allows for plug on the headphones that also allow you to plug in two headphones in and listen to the same source.
*     Works for multiple types of music
*     Great build quality
*    Amazing value when you compare sound, quality, build and look.
 
Drawbacks, every headphone has them:
*     The pads, they are not awful, just not optimal.  However, I am picky on pads and have switched a lot of my pads out on various headphones I own.
*     Mids are slightly recessed, but I prefer them this way.
 
Overall, I feel they are oustanding for sound and value, something I find in most of the V-Moda line.  I cannot think of a company that gives you more bang for the buck and their customer service is certainly another factor to consider in any purchase.

If you look at my profile, I stay within a small range of products that have worked for my son and I.  These include V-Moda, Westone, Audio Technica and Klipsch.  Each have their own strenghts, like Westone does a bang up job of creating high end sound in an over the ear wearable IEM, V-Moda has some seriously well built headphones that have a very nice sound and the Audio Technica ATH-M50 is legendary if you have looked on the head-fi forum.  However, I am not always into the over ear design nor am I able to take the time and effort to insert something "over ear" if I am in the car or cycling on my rode bike.  For those times, I want normal tips with normal insertion, which is something that can always be done with one hand.  The tips that Klipsch has designed are marvelous and while I am not sure if they even designed it, I am givin them credit for it.  Because of the low cost to purchase, my son and I have purchased several of the Klipsch IEMs including the X7i, S4, S3 and the S3M.  Most of these my son used because he could throw them in his back pack and not worry about them, instead of say the UM3X where I berate him if he does not have a case, a cloth and the dessicant pod, but I digress.  Of all of those, I really loved the sound of the S3M.  To me, it sounds fantastic and while not as good as the UM3X, certainly on par when consider value for what you get for $49.  While I don't play them on a flat EQ, I find that a little boost to Latin or Pop (on the iPhone EQ) certainly make it really entertaining and to me is a really "fun" sound.