I've played around with it a bit, and it was fast / responsive... didn't run into a single issue actually. (running DP4).
Mind you, I wasn't using it for my main OS.
If you have a portable Mac, or a Magic Trackpad... You're the most set up for the new OS because of all the gestures built in.
Quickly Launching the LaunchPad with a 4 finger swipe to jump at any app is pretty nice. (mind you half the time now, I just Command-Space, type a few letters for the name and hit enter)
and @ ScruffyPup... The dock shows you whatever apps you've put into it, and your open apps. LaunchPad shows you _ALL_ the apps on your computer. (Since no one has all their icons in their dock)
uombroca saidFor Developers, Is there a compatibility issues with running Parallel 6? I heard there might be.