Never used it but I don't think it's as good as you might hope it is. The clutch bell is chrome which isn't ideal for heat transfer since you actually want the bell to remain cool as possible (to prevent slipping). Chrome traps heat in which is what you don't want. The clutch appears to be a design similar to a Keli heavy model but I can't tell for certain based on the views offered in the pic.
The OEM clutch bell is quite good and we have bikes from stock all the way up to 125cc that uses them. The material of the clutch bell and the weight of it are crucial to proper trans tuning.
Reliable and dependable tuning from 15+ years of experience.