That clutch kit has a fair price, much for the money.
I noticed a huge difference when I replaced my K6 clutch with a clutch from an F2 with its double riveted plate.
(Outer steel basket and inner longer alu hub gripping the metal plates that differ except for the double plate.)
Much more rigid and no rattling when handle it in very low speed.
I reused the not old EBC fiber plates. The harder Barnett springs, 66lb version for the smaller CB's.
CycleX clutch kit for the really high powered bikes at the strip I suppose, full power and release