I replaced my OE clutch a few months ago, It had done just over 80k when I noticed it was starting to slip, not bad for a 20 year old clutch! on removal, it turned out to be LUK branded, with VW Audi written on it, proof of an OE part... my replacement item was also LUK, which I had also heard mixed reports about, on inspection it turned out to be exactly the same as the OE item, only missing the VW Audi logo, Proof was in the pudding, my new clutch is now silky smooth and light in operation, does not slip at all, and believe me, I can, and do drive my car very hard! I would recommend an LUK item to anyone that is looking to change, so long as they stay to sensible BHP.. also bare in mind that any type of competition clutch can be a pig to live with on the road...
Thom