The responsiveness is a much nicer feature than visual transitions and the such, and for a start of a new but similar design I quite like it.
On Ubuntu 10.04 x64 Flash is pretty stable for me, except when I've got 40 Firefox tabs open (yes I'm seeing a therapist about that) and then try to run some Flash app that's more complex than a mere Youtube video. No more popping htop to manually kill nspluginwrapper that's in some kind of infinite loop ftw.