Jury is still out, but I've been reading all about resetting the SMC controller. I tried, no bueno. Then I read on here someone at Apple had a guy reset his PRAM as well. So, I gave that a try and it seems to work. I'm at 95% after surfing this morning a bit and I've got 6:46 remaining. I'll keep checking it but this is pretty much double what was getting as of last night and back in line with my SL install. Also as a data point, I'm running the latest rev MBP15, 2 ghz i7 processor with screen brightness about 85% (3 "blocks" off from 100% full) I'll keep checking today. Hope this works for some of you as well. We will see if it helps the many many beach balls I've had since the upgrade.