Since September 2012 I've been the fortunate owner of a maxxed out 15" rMBP - 2.7Ghz, 16Gb RAM and 750Gb SSD. Yes it cost me a small fortune, but its a total beast Never had a single issue - no ghosting, slow downs, stuttering etc. Never reinstalled OS X or anything like that. Uptime is currently: 0:22 up 70 days, 4:45, 2 users, load averages: 2.54 1.02 1.03 I use it for work, to test 3rd party enterprise software that needs windows or linux servers, hosting databases like Oracle or MS-SQL. It can run 4 or 5 VMWare server machines concurrently, without lag or issues. Its like having a beefy workstation that goes in your bag, and weighs not much. Of course I also use it for fun stuff and the retina screen sometimes makes reality look a bit lo-res So in my experience, and YMMV of course, its a no brainer - if you can afford one I say go for it.