Fantastic, Fantastic, Fantastic is all I can say. Had mine for 6 years, a 2000 model, in the best 'copper colour' regret the day I sold it wish I still had it.
The early ones are the fastest as they are the 'pre-restricted' versions before the 300kmh (186mph) embargo came in. Can't remember which year this was but look at the speedo as the early ones went up to 220mph and the newer ones are about 190mph ish!!
Heavy on front brakes, tyres used to scrub out in 1800 miles until I went to the Avon Storms and used to get 4500 miles from a rear! as mentioned before there was a camchain mod that should have been done on the early ones and lots of the aluminium rear subframes were changed for steel ones, although not officially done as a re-call!
If he is smooth on the throttle the chain will last well really.
Don't bother doing a track day on it in the wet!! I did one at Croft one Novemeber and had the back wheel spinning in 2nd gear at 100mph in the damp, not good!!
I used to have a frustrating fuelling problem when riding in very hot climates, like Barcelona in about 44 degrees. Not sure what it was but bloody dangerous. Having said that it only happened 4 times on me other than that the bike was bomb proof
I can't praise the bike highly enough rode thousands of miles, he will not regret buying one, lucky so and so!!
I spent a fair few quid tuning mine to 170 bhp at the back wheel but after a ride to the Alps I decided to put it back to standard as it ran poorly under 4500rpm and that is motoring so thought best to go to standard again.
Those who ask why tune a Hayabusa the answer is simple, you do get used to the power and just crave more!
Happy hunting