Wow, that's strange, my Skyrocket's Bluetooth works extremely well. I use it with several different headsets and my car's built-in BT, and I get reliable connections and good audio quality. I wonder if some piece of software has gone a little wonky on yours?
So far, battery life seems comparable to the Skyrocket's, but we'll have to test it a few more days before delivering a verdict. BTW, the Mugen extended battery should fit the AT&T version of this phone-- same hardware, battery and design.
At any rate, we will cover Bluetooth and battery life in our written review.