I've used the Muller Power clutch ramp on a couple Buells and had good luck. The ramp angle is steeper and requires less angular lever pull to disengage the clutch. The claim is 20% lighter pull. I guess it could be measured with a fish scale or something but I think I noticed a slight difference, just not sure about the 20%...maybe 10%. It became moot when I went to an extra clutch plate and stiffer springs to handle more HP.
There are some reports of not adjusting it properly but I really don't know how anyone could go wrong with it.
One of those things where certain people should just stay away from spanners, I'm guessing.
Either way, I feel it's a better solution than the ones that have an extended arm. As has been said, you can't get something for nothing when it comes to physics.