I've been shooting some video with the GoPro Hero 3 Black which can do 1080p at 60fps which looks lovely.
Yup, in OS X 10.8.2 playing back 1080p video at 60fps on my MacBook Pro results in so much stuttering its unusable. Trying to edit it in Final Cut Pro X is basically impossible or will drive you crazy in the process.
You get lovely warning messages like this:
As VLC handles it fine I know my laptop has more than enough fire power to play it back, so it must be a QuickTime issue (Final Cut uses QuickTime to decode video as far as I know). According to multiple discussions on the Apple support forums its possibly related to a GPU driver issue and will hopefully be resolved in 10.8.3.
I hope so...