The real benefit of a slipper is when riding hard and fast, such as on track, you don't have time to let the brakes do the braking THEN change into the right gear for driving through and out of the corner - it all happens rather quickly when you're grabbing a handful of Brembo to drop the speed from 130+ to 60-odd for the corner that's 25 metres in front of you at the end of the straight.
The slipper clutch allows you to change down to the right gear for driving out of the corner while still travelling too fast for that gear.
Without a slipper the back wheel locks up, the bike goes sideways and the least of your worries is the state of your underwear.
With the slipper the clutch slips until the speed of the back wheel matches the speed of the engine - no lock-up, no sideways and no unwanted deposits in the skiddies...
Works for me - kept the throttle pinned on the Hanger Straight on Monday until I grabbed the front brake and simultaneously went down 2 gears so Icould get back on the gas as soon as the bike was turned-in. No lock-ups and no slides at all!
Giles
PS. After responding to the hi-jack element of the thread, my advice on the slipping clutch is to check the plain steel plates as well as the friction plates. I had a warped plain one that was causing my clutch to slip - both ways!