While I'm not fond of the black outline around the screens of the new iMacs, it certainly wouldn't be enough to sway me from getting one. However, issues with the screen itself might be enough to make me think twice before making a purchase.
Apparently an issue has started cropping up where users are getting a buildup of condensation behind the glass panel of the screen. I'm no electrician, but in my experience, water anywhere inside of a PC is Bad News Bears.
Apple has made no official statement regarding this latest issue with the iMacs. If you are experiencing the condensation behind the glass, I would advise returning it and getting a replacement unit.
iMac Users Report Condensation Behind LCD Panels [via dailytech]