I have to agree with the concensus here . . . this rom ROCKS!
One of the bigest things for me is that A2DP starts automatically now. When I get into my car and start one of my Podcasts, it imediately plays through the car stereo; I don't have to go ino the BT settings and start it!
The memory leaks seem to have been fixed for the most part - it starts at 52% after a restart and only creeps up a bit from there. I also see far moe 3G coverage than with the old ROM.
I can't say that I have noticed any battery improvement though.
If you haven't updated yet . . . what are you waiting for?