Well, after repairing with my car, and a couple of outgoing phone calls, it would appear that the Bluetooth problems with vehicles' hands-free systems may be better (depending on make and model).
I made a test stereo recording, and though there was some ambient noise from the mic near the lens, I couldn't discern the cycling/cadence electronic noise. I'll make another test video or two while focusing, after 72 hours of operation. (Previously, a factory reset resolved the noise until about 80 hours after operation.)
A little disappointed in Sense 3.6, but in general ICS+Sense3.6 seems snappier, smoother, with no small number of improvements (see separate thread).
AnTuTu Benchmark score didn't improve, but System Panel Pro clearly showed AnTuTu exercising both processor cores:
I downloaded Quandrant Benchmark, which I'd never used before, but its score didn't impress me. The phone doesn't seem to be benchmarking any better,... but real world use of Quell, Osmos, Where's My Water and video
felt like they were loading faster, and exiting and restarting faster. That is, moving from menu to game, back to menu, etc.
Battery life ... I haven't seen anything different. I can compare performance and battery consumption over the next few weeks.