Upload & Sell: Off
Yes, it is well worth the upgrade! The lens correction, noise reduction, live view and just over all image improvement.
I tried downloading the Grand Master/Final Release and like you guys experienced, the servers were slow. I'll try again later.
Hopefully this Final Release has all the bugs shaken out and maybe the latest Canon SDK is in there for 1DX, 5Dii, 5Diii users. I haven't looked into it to see. I had issues with the latest version of Capture One 6 as well as some betas of 7 because canon screwed up with their SDK. I had to resort to image capture and hot folder. I'm still running 6.4.2 right now so I can get functionality on 10.8.2.
Can't wait to have the real deal on the mac.