"I've had it for two years, and have had no problems."4.5 starson by bozjidar
Pros: This thing is feature packed. Really the only thing it doesn't have is the text to speech, meaning it can't pronounce street names, but it does give voice commands/directions.
Cons: The worst thing about it is there is no map update available because Navigon is no longer supporting it. The maps are all made by Navteq, so maybe if all us users get together and bother them they will come up with a map update.