So this morning my 15 inch MacBook Pro Retina died. Pinwheel in Safari, locked up. Rebooted and nada. Couldn't find the HD etc. Brought it to Apple and they confirmed the drive was dead. I lost 3 weeks of stuff and it sucks but I'm glad they helped me. So basically this just a warning. Back up your stuff! Btw.. totally off the subject, but is the desktop faster in geforce mode or intel graphics mode? Thanks.