I'm probably about 5000-6000, as its become my favorite .22 since its one of the few guns I can still shoot effectively with iron sights. Mine's the 7.5" fluted bull barrel model with the fiber optic front.
Had to go back to S&W after less than 1000 rounds as the "hook" at the back broke causing tremendous amount of mis-fires. S&W turned it around quickly and paid the shipping both ways. Gun has been basically perfect since.
Only quirk is most mags will have a stoppage with HP ammo on the second shot (or third of a 10+1 loading) caused by the HP opening catching on the mag catch cutout. Only on the second (or third) shot does things line up to catch, never done it after the second (or third) shot. Other than this its great with all the cheap ammo.
I'm not getting anywhere near the claimed 5000 round life of the plastic recoil spring buffer -- 2000-3000 is more like it. S&W has already send me another package of them for free when I asked.
--wally.