I had the surgery in my 20's. It's been about 15 years now and I am sooo glad I did it.
I grew up riding horses and playing softball (fast pitch). I could get the ball to homeplate from outfield, so I was used quite a bit in the field, thus I made a lot of long hard throws.
One summer, my dad was playing catch with me and warming me up. We were throwing over the roof of the house to help build up my arm, when all of a sudden, it just slipped out of socket. My sholder looked like it was 3 - 4 inches further down my arm than where it should be. Overt he next few years, I would experience things like reaching up for something and my sholder falling out of place causing me to drop the thing (a bag of sugar!!!) stuff like that. I would never carry my kids on that side as I might could have dropped them.
I eventually had enough and went to the dr. Doctor took x-rays with me holding sand bags to put pressure on the sholder. He recommended surgery and had me mentally prepared for taking out part of my hip to use as new bone in the sholder. When he got in there, he discovered that my sholder bone was fine. All I had actually done was "over throw" my arm. I threw too hard and overstretched the muscles, much like overstretching a rubber band. Sometimes the muscles just don't go back to their original size.
Anyway, in my case my rotator cuff is not "built" correctly. A normal rotator cuff has a deep curve (think about an ice cream scooper). Mine is more shallow, like a teaspoon (not much curve). So when I over stretched those muscles, it allowed all the sholder parts to fall out their intended positions. So he left my rotator cuff alone and took the muscle back there, cut it and then braided it together and pulled it across where it should have been in the first place.
I was in a partial body brace (from hip to fingertip on that side) for 12 weeks. The arm I had surgery on was kept in an almost straight up position. I had to be careful where I walked as I would hit door frames with my hand, and riding in the car was interesting! Each week they would bring the sholder area down and over until I was carrying it in a sling in front of me.
Physical therapy was a pretty painful at first, but got better over time/with healing.
All in all it was well worth it.