Some thoughts from a novice ear with the 750.
A very different experience than I've had with previous IEM's, much more of an airy and spacious sense. I assume that owes itself to the unique driver in it. They are absolutely the nicest looking in ears I've owned. Definitely acts more like a driver in a full size phone than what I would think of an IEM. I like the period where the sound is still coming together, both with the hardware and just getting accustomed to them. The amount of detail at lower volumes is pretty impressive as well.
I wouldn't describe the bass as having bloat, I was worried it would drown out the mids especially but so far very nice all around. I look forward to it balancing out even more with use and time. I travel daily in NYC and isolation was really nice, without feeling too closed in (As it did at times when I had used Shure Triple flange tips on BA200 and 530, though they're still my favorite tips)
I had a bunch of different stuff running through, I tend to use Fugazi, Black Sabbath, Unwound and Soundgarden as a gauge for the Rock end. Again this is just general stuff, I don't have quite the ear as others. My 530's will still be my backup, I'll be recabling them soon through BTG.
Edited by Hank_Venture - 4/28/14 at 8:12pm