I have been reading this thread with interest as I have been thinking about having the Centra drive unit fitted at the next service as I am on my second "classic" compensator.
But to be honest when it is pumped full of high pressure grease there is no knocking, backlash or excessive vibration, in fact it is as quiet as a mouse, and will quite happily drive at 2000-2200rpm in 4th gear.
So I think I'll stock up on grease cartridges and stick with it, if it aint broke etc. etc.
