Mine is a cheap Chinese copy off eBay .. ref AC-ZJZYQ-1085 cost £43 it shed the belt on my last lap at Stretton in July It’s ran the May meet as well. I’ve got spare belts. I’ve had no probs so far
The Comet one seems to be about £160 so I could buy four of mine for the same price. Not sure if any of the parts are interchangeable.
I’m tempted to buy another one as a spare if I need it.