Had a 2003 model brand new in 2005. Needed the suspension setting up (thankfully it has loads of adjustment,the most adjustable I've come across on a stock bike) had to run on super unleaded fuel so it didn't cut out. Added 2 teeth to the rear sprocket which boosted acceleration and top speed went up to 165mph.
They need thrashing regular to make decent power, top end was about 140mph when it was first run in.
Once gearing was changed it was the same performance as my 2002 R6. Handling was better though especially in the wet. Not as good on the brakes due to extra weight, but emergency mid corner braking was safe if you went in too hard.
Handling would go off every 2500 miles if both tyres weren't replaced. Fuel economy was worst than my ZX12R at an average of 35mpg.
Best road bike I have ridden on the road for twisty bits, especially in the wet, extra weight would see it struggle against a 600 on a track in the dry. I could leave my mate for dead on a twisty road on his 04 GSXR 750 and that was when I was still running it in.
Admittedly I have raced, this is the closest thing I have ridden on the road to a proper race bike. It needs forcing into a corner but once it's there it won't move off line unless you want it to. A true riders bike that rewards ability and aggression, if you don't have it you will be slow. Most of my friends couldn't ride it that well, preferring the easier steering of jap sportsbikes.
In the 6000 miles I did I had no reliability issues apart from engine cutting out on normal fuel. The clutch whined on hot days from standstill. Partially cured by drilling holes in the clutch cover. Wheelies were easy to hook up and control. I abused this bike as much as any others I owned, but I got rid of it mainly because of paranoia.
Got a reasonable trade in, probably fell apart when the next owner got it, who knows?