Right now, without overclocking, my battery life is about 30-40% better. I unplugged at 7 am, and with some texting, a call, and some poor signal areas, i'm still at 80% at 1:30 pm. 2.0.1 for me would be about 60-70%.
The camera quality does not necessarily improve, although the focus is a little better. However, it is much, much faster booting, making it easier to use, and easier to get that second shot to correct the crappy first shot
