Hi all,
I just managed to talk my friend - who is returning to riding - into buying an S4 (racing yellow)

. The bike is in pretty good condition with 7K miles on the clock and 2 previous owners who didn't know much about riding

.
Anyway, I went to pick up the bike for my friend and after having put new BT 016 tyres on I headed straight for the racetrack.
I am not a pro rider but a fairly good amateur. I, myself, have an Aprilia RSV Factory (used to have a 999S too) into which I have put more than 16K miles in 2 years (about 1,5K on track).
I have to say that - though I had high expectations - I was amazed by the S4. It had stock setup and I was in a great hurry so didn't have the time to play with the suspension. So, the front was way too soft, the rear seemed to be OK. It was shaking its front wheel when hard on the brakes (having new tyres the cause might be the wheel or the softness of the front suspension).
But all in all, I wasn't much slower on the S4 than on my RSV. Well, the S4 could certainly do with a bit more power, say 20-30 HP more. On the straights it was obvious. On the other hand, the chassis is really fantastic and it was amazing how I could change lines when fully leant over.
One thing I noticed, I couldn't trail brake into corners as I can on my RSV. The S4 wanted to stand up when I tried to trail brake. The difference may be due to the Öhlins forks and Brembo radial brakes on the Ape or is it possible that this could be tuned out of the S4 with proper suspension setup?
I certainly had a very good time and so much fun. The guys on GSXRs and R1s must have been pretty surprised a couple of times

.
Great bike, I am glad I have recommended this bike to my friend.
cheers
adam