I've followed there developement from day 1 pretty much. They all have the same things in common no matter which factory they came from:-
something wont work
the supplier wont provide any support
the all buzz on low volume (crap amplifiers)
a newer version will come along a few months later that correct some problems but creates more
have a read http://www.golfmkv.com/forums/forumdisplay.php?f=15
6050 is one, 7608 is another etc etc
audiosources are possible the most legit to deal with if you really feel the need