I got off of Ebay, the quality is ok, looks better that the standard rear off my TDI. Fit is decent, it lines through with the wheel arches nicely. Only thing is I think it sticks out slightly further at the back than a genuine one.
However for the price I paid it does the job and looks pretty good. Only reason I went non-genuine is because my car is Graphite Blue and R32 parts in that colour are non-existent so by the time I'd had a genuine one re-painted I'd have been paying big money.