| It depends what your using the bike for, if racing and flying into the Pembrey hairpin say and knocking down 3 gears from when you start braking, it gives both your engine and final drive a easier time if you have a slipper clutch, probably why Ducati fit them as standard on 748R's, RS's etc. On the other hand if road riding (DSC rideout etc) then no you don't need one, which is why my road bike has very few mods.
Its just like tyres a decent rider on normal road rubber, will go round Mallory in less than a minute, with no need for slicks, Super Corsa's , D207GP's and a like, which is like saying most riders using sticky rubber on trackdays etc and not getting within say 4-5 secs of the Supersport lap record are using such tyres to cover the incompetence of a poor rider, not to mention the use of tyre warmers on trackdays. But I would still consider fitting track rubber a sound investment.
After all what do you really need to ride fast on the track, all Paul Lewis needs is his Harley Davidson and is still waiting for somebody to take up his challenge for a race around Mallory.
As for pro suspension set-up, I'm happy enough doing my own, so its not on my list and I can't be doing a bad job of it as within 2 practice sessions at the IOM TT with neither myself or Adrian having ever raced a R6 before, managed to have it lapping at over 110mph and got it good enough to take a untuned bike to 21st in the Junior TT.  | 
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