I just upgraded from .5 to .6.1. I wiped cache/reset, installed fresh, and then restored apps/data via Titanium.
Now, when I get a call in and I want to answer through my Bluetooth headset, the call doesn't immediately go to Bluetooth even though I answered via the headset. It answers on the handset and eventually switches over to bluetooth some 20 seconds later.
This is crazy annoying as I can't be fumbling with the phone while answering a call in my car.