Yes, I had my left knee done a couple years ago. The surgery is generally successful with most people. About 2-5% have troubles. I'm in that 2-5%
Would I do it again? Yes. The troubles i have now are much less than before the surgery. I still have pain, but not even close to what I had before the surgery. Now my right knee needs to be done. Hopefully this time will be more successful than before. I'm getting regular cortisone injections now to hold me over until I'm ready (probably next year sometime). It's very painful though.
As some have mentioned, PT is the most important thing to success. I was diligent with the PT but still had some issues that I won't go into right now. As Skippy mentioned with his mother, I too have trouble kneeling on mine.
Again, I would and will be doing it again as I have no other options if I don't want to live with the pain.