What is bad about it?
I also don't see how off the shelf clutches could possibly be better for 99.9% of the applications. My Jim Berry clutch is easy to drive, not too heavy, holds 272rwkw, smashes drive shafts, cost only $1000 delivered, came with lifetime free advice from a genuine expert. What's better than that? Adrians did all that mine does plus it lasted a long time under serious racing conditions. What's better than that?