Love it. I've had great luck with it. It has some throwout noise, but i read most of them do, so i don't worry about it, and it hasn't gotten any louder or quiter after almost 5k miles.
I got the NV3550, and i dealt with the owner, not some sub human, speaking over the internet from Transfartistan. Prices were great, after a little negotiation, hehehe.