This release works on the 770 and N800, but you may find it too slow to use on the 770. It depends on your personal tastes, but the combination of database use and rotational functionality have slowed down screen drawing significantly. I personally find it very usable, especially if you leave "Auto-Rotate" disabled and keep your Pan Sensitivity down. If you're not sure, then give it a whirl. You can always downgrade if you don't like it (just don't delete all your old maps!).