So I decided to jump ship from my old SE215s to the SE535LTDs.  Originally I thought these IEMs sounded like crap and I thought I got a chinese copy or something.  Though then when I attached one SE215 bud on one ear and a 535 bud on another, I came to realize that wow the 535 is lacking in the bass department compared to the SE215s.  I decided to screw it and keep them and burn them in to see how the sound changes. 
 
Sound:
 
After burning these guys in, it's safe to say that these were a great investment, the sound stage is excellent, the highs are crisp and the in house shure mids are great as always.  Listening to one of my favorite bands Yes, the acoustic guitar is so crisp and clear I get goosebumps every time I listen to them, and the vocals mixed in just give me a sense of high thanks to their clarity and great sound.  As stated before, these IEMs are lacking a bit in the bass department but turning up the bass in your EQ should fix the problem.
 
Comfort/Isolation:
 
I've always liked Shure's IEMs because they were always comfortable in my ear and I can usually listen for an endless ammount of hours.  Shure's regular olives are great isolators and feel great in the ear as long you put them in correctly.  I'm using UE900 wires that I've modded so that they don't have the memory wire from my 215s, but the stock wires that come with the IEMs are pretty good and comfortable when I worn them, though some people may not find the memory wire comfortable to wear.
 
Anyways, these were a great investment and I'm glad I've bought them, the only reason why I wouldn't recommend buying these are if you're a bass head, you'll most likely will not enjoy these IEMs.

Hiya! These shures were my first into the world of IEMs and the beginnings of my journey to being an Audiophile. Back then, I was skeptical of Beats(and I was right on track back then) and thought Bose was where it was at.  I owned the Bose IE2 before getting my shure pairs, and after that, entered the realm of the audiophile.  Recently these guys broke after around a year of constantly listening to these, and I'm sad to let them go.  Now I have a Sennheiser IE8 which has about a week of burning in. Which I will be using for comparison. 
 
 
Sound quality, The Shure's bass doesn't compete with IE8s, but the bass was still there, just never felt as prominent or warm as the IE8s.  The best thing about the SE215 is that IE8 doesn't compete with the vocals on the SE215.  The Mids were great, and The Vocals were crisp and clear, and whenever it gets to a prominent vocal part on my SE215s, I've always had goosebumps.  The highs on the SE215 isn't that bad, but it isn't crisp and clear as in the IE8s, I would say it's a step lower the IE8s sound for highs.
 
The Isolation on these IEMs are great, Shure has done a great job with their olive foam tips, as they are comfortable and give great isolation, I had to mod my olive tips just to put on my IE8s so that I could get somewhat the same isolation as I had before on my shures. Comfort wise, it depends on the cables.  I've used the original stock cables for some time and found the memory wire to cause discomfort at times, other times it worked out.  I then picked up the Fiio aftermarket cables which improve the sound slightly, and gave me a lot more comfort when wearing my shures.
 
All-in-all, these are a great little pair of IEMs and a great step for becoming an audiophile, and i would recommend these to anyone