Well, got the T2Plus in my ears right now.
Soundquality-wise nothing to complain about really. (that's a breath-of-fresh-air review compared with some of the audiophile reviews out there, not?)
Got the best sound with the supplied foam eartips. Sadly, those seem to be of single-use quality. After listening for an hour I removed them, and now they seem to be permanently disfigured already, providing no fit and isolation at all anymore. The supplied silicone tips are all single flange, and don't provide the desired fit either, so now I'm wearing the IEMs with some old double flange tips I had lying around.
The greatest difference with my previous IEMs is the cable: the chafing sound this cable transfers is almost negligible with respect to my old one. Makes listening while on the move all the more comfortable.
Now I just need to find out if there exist durable foam tips, since these do seem to provide the best sound quality.