Well I just don't buy the whole "burn in" thing (I've never experienced it besides psychological), but if they get better I won't complain!
And thanks, I spent a bit of time with these last night and there is much to like. Bass, for instance, is for me just about perfect. Deep, authoritative, tight, taut, quick, detailed/articulate, and, best of all, not TOO much. It's not anemic, but it's not over done.
Now I know this is an appreciation thread, but I have to say the mids and highs are less impressive so far. They're not at all bad, but it seems the mids are somewhat recessed and "dark" and could use more "air". No, these aren't closed in sounding, and I knew they didn't have the widest sound stage when purchasing (I don't care much about that as long as I don't feel like I'm in a cave), but it seems vocals, for instance, need more space and to be brought forward. The highs are good in many ways, good air and detail, but they are also brash and maybe overly aggressive.
On a whole, so far, with about only 2-3 hours spent with these (most of that being tired and not really concentrating on the sound), I like them. The best thing I can say for them is that I when I tried to concentrate on the sound I found myself too engaged with the music to do so...they distracted me by forcing me to be more emotive instead of analytical iow. Not at all a bad thing! These seem to be engaging (addicting! haha!) IEM's that propel songs forward with great PRaT (minus a T! haha again!). They are not laid back or sluggish, two things I don't like, but they aren't overly aggressive or hyper either. Exciting without being annoying maybe.
In contrast to my other cans/IEM's, well I'll wait to place them. I still have yet to really mess with tips after all! But I will say that these remind me of my DT 770's actually. Like them they have kind of dark and recessed mids with good strong bass and somewhat hard/metallicy highs. I don't know which one is better yet and I don't even know if comparing IEM's to full sized cans is fair. It seems, all things being equal (price and such) full sized will always win.