My one issue with the latest Apple scrollbar is that I've yet to figure out a convenient way to scroll horizontally. The horizontal scrollbar is almost always hidden, I can't use my mouse wheel to bring it up, and using arrow keys doesn't always work either.
If anyone has a suggestion, shoot. I went so far as looking for a hotkey for toggling scrollbar display (which I still think would be a good idea), but couldn't find anything. For the record, I'm using Synergy to control mouse/keyboard from a Ubuntu box with a MBP slave machine.