yeah some of them you just start paying fo the name I reckon, I was advised that that toda one was pretty good and resonably priced, I think it has the lowest weight which also gives the best performance but im sure there wouldnt be much in it if measurable at all!
the only problem with mine is a bit of vibration when slowing down etc betwen about 2-3000 rpm but im think its actually the clutch as it doesnt have any springs or something likr that i was told, bit of pain in the arse in slow traffic as not much play in the clutch. it must be a toda clutch two, i wouldnt recomend that clutch but it must be good apart from that.
on my flywheel and clutch box it says for racing purposes only, not to be used on the road etc!!!!!!so that sums it up, also not for sale outside of japan! although it is obviously!