seems like one of those headunits that vw-er's love to use to replace their oem headunits. my bet is that it'll probably be okay for the money, highly customizable, which is a double edge sword. i had a friend who bought one for his jetta and messed something up and his nav stopped working until i fixed it for him.
for 600 u could probably buy any more well known double din head unit, then buy the factory trim piece for your car to make it look "factory". if you're not adventurous that's what i'd recommend you do.
This is an example of a double din w/ the trim piece. there are threads w/ more pics from ppl.