I have just purchased my 2nd v11s, a 2003 model, I made it part of the sale that the spring and boss were changed before purchase. watched the job been done. the boss was oversize 16mm. Other than a slight oil leak at the back of the gearbox I have had no problems with either bike. The first bike did 22000miles a 1999 model.
the hardest part, sweep, is finding a dealer who you can relie on when needed, and not just wanting it off the shop floor.
My local Aprillia dealer will quite happily sell you a v11 but doesn't want to know after that.