I wnet through three Black diamond clutches in 15k on my MK2, they are crap! They uprate the driven plate with hefty springs, but the friction plate is a chap and nasty thing, (oem supposedly). All that happens is there is a massive force fromt he hefty springs when taking up drive, which after a few K, rips the centre out of the friction disc! Black diamond repalced it twice, but it costs as much as the clutch to have it fitted, so I still lost out!
I now run a standard VAG clutch in the MK2, its lasted 10k and is smooth as silk, no slippage touch wood! I would not waste your money on the Black Diamond stuff, stay standard or go for the helix / G60 kit or I think Neuspeed do one too, including a flywheel.