Amazingly cool.

This app is a hidden gem. It is worth the cost just for the accuracy of the compass -- even on the 3G without the built-in compass it works flawlessly. Yes, it is dim (but still visible) in the daytime, but the first time you drive at night with this sitting on your dashboard, youll be blown away. I cannot put into words how awesome this app is. It deserves to be in the top 10. Notes to the developers: the "HUD" button is hard to hit just right; Id like it to start in HUD mode by default.

Lostzilla about aSmart HUD