Molten is good but it seems each release has a lot of untested bugs discovered, but still love the work Ryman is doing on it.
I'm sticking with Eclipse. Currently running the official 1.2 release right now, but getting ready to try 1.3RC that just came out which has the Bionic camera in it. Actually, I went ahead and pulled the Camera.apk from the 1.3RC and installed it on my 1.2 Eclipse release and I like it.
Battery life seems good with Eclipse, but I'm also running Juice Defender Ultimate which has REALLY helped out with my battery. In fact, Saturday night I forgot to plug in my phone and had to be out of the house for the entire day on Sunday. By the time I got home around 4 pm, I was down to 14% battery which was about 20 hours without charging. This was with texting, playing games, downloading updates and listening to a radio broadcast of an NFL game (for about 10 minutes and then decided it was best NOT to do this as I was already down to about 30% at the time).
Not bad if you ask me.