Depending on price & kit fitted, you could get a bargin... but to avoid any nasty suprises look at the following.
Check list:1) transmission upgrade kit done? if not, I'd hesitate....( however if it's still good by 40k, it's likely alright)
check if it jumps outa 2nd on hard acceleration( if you can test ride)
2)Fork springs.. how soggy is the front end when you bounce test the forks? ( replacing springs with progressive ones is, however, a cheap repair & needs doing as maintainance)
3) Corrosion! good way of seeing how well it's maintained.
4) Service record.. ( obvious)
5) reason for sale