Someone recently offered to trade me their 15" Late 2011 MBP for my comparably spec'd Late 2011 iMac. His is actually BTO and has a slightly larger hard drive and an i7 processor as opposed to my i5. Both are still under warranty for a few months (purchased prior to their respective 2012 refreshes), so could be repaired if any issues are found. Should I go for it? I've been thinking that I would like a bit more portability from my machine, although admittedly I don't know how often it would leave my desk.