Well I just ordered these. I have been mostly into closed full size cans and could never find a good set I liked for sound and travel. There was just always too many compromises. That led me to pick up a cheap set of Shure SE215s. They isolate better than any full size and sound really good. Well that good sound was a blessing and a curse. It always leads me to wondering how much better it could get. After thorough research of Head-Fi, I was led here. I was looking for the same thing I have been looking for in my full size. I want good bass without being overbearing along with details, great high end air and lush mids. The Shures delivered on the bass and mids. The bass was a little overbearing at times and not as controlled as I wanted. The highs, details and air was never really there. The Shures just seemed to get congested. I almost purchased the MkIIs a couple of times. After being truthful with myself I think I value a little more kick in the low end than I do clarity. They should be here Saturday. Hopefully these will be a real step up from the Shures. I have tried out a few fairly high end IEMs that didn't make me want to leave the Shures, most notably the IE80s and UE900s. Both were better IEMs but not nearly worth the cost difference. The VSonics hit the cost/performance sweet spot but the Shures are pretty good bang for the buck. The last thing I am hoping for is good isolation. I know it probably wont be as good as the Shures but hopefully its close.
I find they isolate pretty decently. I now use the Sony Hybrid Greens (official ones from the set on Amazon for $8) and they are nicer than the included duplicates, so I can recommend looking into that. I was using the stock tips they come with installed and those were pretty excellent too, but I find the hybrids stay in my ears better. Honestly, I think you will be satisfied. The bass goes deep and is textured, adds some enhancement to the mids without bleeding into them, and the detail is astounding and seperated. I use them so frequently now, I am considering retiring my other 2 IEMs all together - they truly are versatile for every genre I've thrown their way. Also, I think the Fiio E11 pairs very nicely with them as well, if you are considering a portable amp.
Edited by modulor - 1/17/13 at 7:19pm