Been using my stock 2.3/8/256 Retina macbook pro for just over 30 months now. its been under heavy use nearly every day, with the gt 650m being clocked at 1035/1674 for about 8 months now. Even dropped it onto concrete stairs by accident at Uni last year , and i have to say this thing is a beast. Still feels as if its brand new, and even tho the gpu has been overclocked for a long time now, the temps still don't creep past 78C. I guess now I'll wait and see if this years rendition is worth the upgrade, or if it will be as disappointing as the 2013/14 releases.