I have a nuvi 750, it's a great little unit. Much better than my old (and bigger) Magellan. It found me a nice backroad way to my friends place that shaved alot of time off the trip due to less traffic. Though I will say the GPS pissed me off today, started taking me the wrong way to an address. Literally the wrong way, not a detour/alternate could be faster route. Nope had me going south when I should of went north a block to get to the address. I'll have to play around with it more. I could of punched in the wrong address though, or with vegas adding 30 roads a week it could of just not had the address loaded in the system. Everywhere's else I've used it (highway and in city) it's been spot on.
I'd recommend it to anyone. I also recommend the ProClip mount. I puchased one tanks to Shipkillers advice and it's great. I got just the mount, not the adapter. Getting the mount to go just under the aluminum trim was annoying, the little plastic lever they give you IMO sucks. But you can make it work. I stuck the black disk thinger on the mount then just used the suction cup piece to connect it to the mount. Works great, even withstands hard driving.