Based on mostly some of the posts in this thread, and the $100 rebate, my new TomTom 910 came in a few days ago. I have to say that even though I haven't used it for more then the most basic point A to B stuff yet, I totally love this unit. I figure that any GPS that has my street built into it can't be all that bad.
It's pretty intutitive, though some of the menus are not where you would expect them, it's dead on accurate so far, it's quiet when you want it to be (for example, it doesn't constantly beep or annoy you when it's recalculating), and it's incrediby fast at it's route selection.
It will be coming over to Europe later in the spring, having those maps build in were a huge plus.