I toured a bit of Europe last year with my smartphone. It was a pain in the ass. The signal dropped out several times. Not what you need. And I love the idea of the on-line community with the Garmin basecamp software. Works with gloves on too
The maps are pretty accurate, but I don't think we are at degrees of bends yet. Your not likely to be looking at the sat-nav going round one anyway There are loads of reviews for the 390 out there, but I was looking for a foccers opinion before I part with my dosh.