I've been playing with it on an external drive on and off since last week, but for the 4th time (5th year) in a row I've gone back to 10.6, i'm glad I didn't install it on my main drive. These are the main bugs I noticed while using it...
- The right 1cm edge of my magic trackpad seems to ignore fast single finger movements, it's as if its waiting to see if i'm doing the notification area swipe gesture - even when that option is not ticked. very annoying.
- Trackpad gestures seem to randomly stop working, you have to go to trackpad settings and change any option and it starts working again.
- I can't seem to update Aperture, I have a boxed retail version, so can't use the app store to download it.
- In safari, bookmarks in the bookmarks menu appear faint until you hover over them, then they look fine until the next time you use the menu.
- No page title in safari unless you have tab bar visible at all times.
- In iTunes if you block access to the store using parental controls you can still get to it via the "go to the store" button in the videos or tv shows sections when you have no movies etc.
Other annoyances - probably intentional...
No option for key repeat in keyboard options, you always get the foreign letter popup when you hold a key down.
And it is too bright, i can understand what everyone means about the new styling, which for the most part is OK, but it's just so washed out and button are hard to understand.