I've stuck with Lion so far with no complaints, and was wondering if upgrading to Maverick will be worthwhile. I didn't upgrade to ML since I was content with Lion and read lots about decreased battery life on ML. One thing I do miss is the Messages app that was taken away once the beta phase ended.. Will upgrading to Maverick actually help my current battery life? I wasn't able to find other posts about 2011 MBAs, especially still on Lion. Anyone have experience with this? Thanks!