It's cool, but a little pricey for what it is. You can buy one of those Torque app dongles for a lot less and do the code stuff at least, which is what I would probably use it for the most. Not sure about the gas and navigating, but things like auto 911 call if there's a crash and parking locator are a little gimmicky. I downloaded one of those parking apps before and don't think I've ever used it.
I would however love to see the score I get when it keeps track of braking, fast accelerating, and speeding.