first off the clutch was on the bike when I bought it,i can drop the bike through the gears without the revs going sky high and the rear locking up.i don't think its really necessary as I never had one on my 1098 and was never on issue, mind you its a lovely bit of kit and another nice facet of ownership.
Not needed I agree, but, if you have a slipper and ride with the slipper in mind then your style changes altogether, once you become retuned to dropping two or three gears at a time on corner entry etc going back to a bike with out one is like a trip to the dark ages
