I've noticed battery life shorter than GummyJar, but not too big of a difference to make me care. I assume it will get better with time, just like GummyJar did for me.
One thing though, last Friday I drove 3 hours to Indy. On the start of my trip, I had 80% battery life. I also had it plugged into a car dock. When I got to my destination I was at 40%. Saw the lightning bolt on the battery every time I glanced at the phone so I dunno. Been fine since.. maybe it was a bad connection, I almost loaded up my Gummy back, though.