Being a Garmin, I'd wait until a couple of firmware updates have been released. Couple of folks have already picked it up and it sounds like some folks are already having issues, so I suspect it'll be similar to every other Garmin product release.
The features do look nice but I'll need to get new Garmin mounts since it's longer than the 800.
My commute is going to be 9-10 miles each way, so I'm trying to decide what size pannier I should get that'll hold my lunch and a set of clothes.