So I just got them, and listened to them for a few minutes.
Damned if they don't sound at least as good, if not better, than both of my Senns [497 & 280], at least straight out of the box [to be fair, they sound a lot like my 497s; the 280s sound a bit different].
First, the aesthetics: I had to use the big tips they came with, but it feels like they'll work okay, at least for the time being. I'm still looking into tips, though, just in case: I have yet to walk around outside or really do anything other than walking around in my apartment, though, so I won't have a true idea of how much I like its isolation or security of fit. I will say, though, that the reviews on here were spot on about these: they are a bit heavy in my ear, though not too much so [though other than standard cheapies & my sister's S4, I really have no basis of comparison], and while they're better fitting cable-up, the connectors from the cable to the bud kind of make it difficult. Plus, the cord cinch really is basically useless, and microphonics really are worse cable-down [though either way, it doesn't bother me too much yet].
Sound-wise, it seems a bit bass & mid heavy, but I'm sure with proper burn-in, the highs will come through better. Still, I definitely love the sound, and it's definitely hella fun to listen to. I hope it doesn't sound too much different after burn-in [which I generally prefer to do the natural way - through hours of my own listening, not letting it sit and play overnight]. For the record, though, I've heard they need about 50 hours of burn-in. Is that right?
A few things, though. I think that I will eventually experiment with tips; I'm sure at some point, I'll try out the Sony Hybrids, the MEElec tips Napilopez mentioned, the Comply T400s, and the UE tips. Also, I'll be on the hunt for a small hard case for these, as I'm not a big fan of the leather pouch it comes in [if I use it too much, I assume it'll wear out too fast, and also won't protect my phones well enough if I put them in my pocket]. In addition, the replaceable cables intrigue me. I know that the SA cables apparently fit fine, but I'm curious if they improve the sound any.
I have to say, I spent about as much on these as I did on my other two big 'phones combined, but it sounds like it's going to be all kinds of worth it.
As an endnote, it's funny for me. While I don't quite consider myself an audiophile, I'm well on my way there. I already want to purchase other IEMs [in particular, the Soundmagic PL-50]. Plus, most of the people around me don't understand why I've spent as much as I have on my 'phones: my dad can sort of tell the difference, as can my sister - to a lesser extent - but most others, like my roommate, don't hear any difference. That's okay, though, because my ears are rapidly getting better at dissecting sound, and these sound terrific....