Does anyone have some personal experience to share about the battery life on the new MBP? The 13 in released in 2010 is advertised as having 10 hours of battery life, but the current one say it only gets 7 hours. I'm contemplating getting a referb of last years model because it's cheaper and the reported loss of battery life on the new models doesn't make me want to pay $1199 when i could pay $899... Thoughts? Is sandy bridge just a power hog?