Petrosc - I've had many a ride on an RSV-R Mille, a mate of mine has one, I took it over for a great 250 mile blast through the Loire Valley last May. I've also ridden it round town in Southampton a bit and it behaves well.
Stonking engine, impecable handling, for me I found the seat height lovely and tall for such a focused sportsbike........the layout of the switchgear's shite though (you'll see what I mean when you take one out!)
As mentioned in the above responses the after sales is atrocious - you're talking waiting months is some cases for simple items.
The 'R' has lighter wheels, Ohlins shocks and steering damper, radial brakes (on the lastest one) and a different chip to the standard RSV Mille.
Both models feature a slipper clutch that is prone to playing up - the idea is that with such high compression the slipper stops the rear wheel slipping or locking on downchanges, however I know of two people who's bikes clutches slipped from new when they gave it a handful in 5th or 6th.
After my spell on one I feel that even at 6'4" I could live with it. The decals are just stuck on the fairing and prone to peeling off of their own accord. But apart from the above they're bloody great.
My mate Lee went out on Sunday and a stone chipped his front fork leg - under compression the chip fooked the fork seal and it began weeping - took it to the dealer who said it can't be done under warranty - ?1400 thank you very much!
Oh and don't put fully synthetic oil in one for fooks sake - it invalidates your warranty................
If it was me I'd stick with an SP1 or 2, possibly blag a ride on that new Suzuki SV1000 - now that does look fun..................