I just wanted to chime in about the SE215 I just got yesterday. I'm using them with my Samsung Galaxy Note II, and so far, it's been a bit of a mixed bag.
First impressions outside of the box were good. The durability seems excellent. Isolation seems good too, but I still have to test these on public transport to compare them with my other IEM's. I do like how they look as well. I got three pairs of Shure flex tips and three pairs of Shure olives. So far the largest olives and medium flex tips seem to fit my ears best.
It does take quite a while to figure out how to insert them properly, because the memory wire is very stubborn and the cable can move around freely in the earphone socket. I don't understand why Shure decided to make this design decision, in my opinion the cable would be a bit easier to live with if they would stay in place in the sockets. Other than that, the plug is just too darn big. I have a tpu case on my Note II, but it doesn't leave enough room for me to insert the plug. So my only choice is to not use the case if I want to listen to some music. Not a big downside, but an annoyance either way.
I can be brief about sound quality. Bass is good so far. Quantity is comparable to my Meelectronics M11+, but quality is significantly better. The mids are good as well, but I feel they could be a *tad* more forward. The highs... well... I find those pretty lackluster so far. I mainly listen to rock (stoner, alternative), but the guitar solos and vocals just don't have enough presence or shimmer to my ears. I preferred the highs of my M11+, even though I can clearly hear that the quality of the highs is better on the SE215. I do enjoy that the Shure's have literally no sibilance whatsoever, at least at low volume.
So, in conclusion, I'm still going to need to give these some more time. I don't find the sound signature to be "fun" as much as I hoped, because the highs are disappointing. I think I need some time with these to get used to the sound and maybe the lows will back down a bit over time to give the highs some more room. Quality-wise these are very good for the money, but I think these will disappoint you if you like your highs to be more forward.
EDIT: Shuffle just decided to play "The Girl and the Robot" by Röyksopp, and it sounded amazing. I guess these will work well if you're into EDM or electronic music.
Edited by Belabor - 2/6/13 at 3:05am