I picked up my SE215's today from Guitar Center, and my first impressions are not positive at all.
First off, I absolutely hate this over-the-ear design. I like regular IEM's, not these with this weird looking(and feeling) design, and having to wrap the cable over your ear. It's overall just uncomfortable for me, and a pain in the ass to put them in. I'm going to have to go to the Shure site though and see if there are any tips to putting these in easier.
And as far as sound quality goes, again, I'm not really impressed. The bass is there, but I like a clearer sounding headphone. Plus to my ears I'm not getting much of a sound stage. I personally think my Sennheiser CX 300-II's are MUCH better in just about every aspect(which I would still be using if I did accidentally drown one of the drivers in candle wax, and no longer have the receipt to get them replaced).
Overall build quality is great though in my opinion.
I'm going to use them for a couple days and hope they break in some. But if I continue to dislike them, then I'm going to put an ad up to see if someone wants to trade(I'm wanting the RE0's or RE-Zero's), as I'm not allowed to return IEM's to Guitar Center. I even purchased the additional two year full warranty from Guitar Center, on top of the two year limited warranty that Shure gives you.
But again, these are just my first impressions. Who knows, I might fall in love with them in a couple days.