I got to spend a little time talking to him about it at the LA/OC Audio Society meet; here's the deal: The lucky little buger evidently has his life well enough in order that he can follow his heart. He felt like there was "something else" out there awaiting him and that working for UE just wasn't what he was called to do at the moment. So he quit. And he's awaiting the muses arrival. Untill then he helps UE out when they need to do a demo and such. He's a free spirit, that's for sure; and I tend to think he's going to find whatever he's looking for. Pretty cool.
On the UE11:
I've just spent all day listening to the 10 vs. 11 and, well.... it's not an obvious call---even though there are some obvious differences. I've read the threads and I think there's some decent zeroing in on the characteristic going on. So, I'm not going to say anything that's not been hinted at already.
The UE11 is a FUN headphone to listen to. It's warm, no doubt, probably to a fault (but that's another story), but I just can't keep a smile off my face while listening to them. I'm pretty averse to anything that's bright and harsh, but there's something in the highs of these cans that's both sparkling AND smooth. Odd! Just great fun to listen to, but I can't put my finger on what's really going on; maybe it has something to do with coherence and time alignment, but quick, articulate highs that are also smooth and musical is a hard to find combination.
But the bass is just too much. It's tight, textured, well damped, and extraordinarily articulate, but it's maybe three dB too much. While I have great fun listening to them, every once in a while my attention is drawn away from the music and to the intensity of the mid and/or upper bass.
However, when I return to the UE10 I find them flat (not neutral, but like flat soda ... stale) and somewhat boring in comparison.
I'm going to spend some time listening to the 10 and 11 again tomorrow, and I'll throw in some 530 and triple fi listening as well, and I'll post again.
I'll repeat: these headphones are FUN to listen to.