Here is my story:
By the time I finished high school I was on the large end of DDD/F. I had my first child at 24 and grew to a size K. When I weaned her, I did not shrink back down. I had serious back/shoulder/neck/headache pain and couldn't care for my daughter the way I wanted, so I decided to have the surgery. Post surgery I was a C. I got pregnant 11 months after surgery, miscarried, got pregnant again 16 months after surgery. I grew back 2 cup sizes with pregnancy/nursing (which is still smaller than my high school size) but again have not shrunk post-weaning. Most women do, though, I'm just unlucky.
Having BF my first, I had an advantage over most BFAR mamas in that I already knew how to BF, I just had to make adjustments to BFAR. I educated myself and was prepared to supplement, or so I thought. But giving my second DD formula was a lot harder than I thought. Without herbs/meds I only made ~25% of what she needed. With domperidone, I got up to ~65%. BFAR in the early months was one of the hardest things I've ever done, but I'm very glad I stuck with it.
For me, the surgery was very much a blessing and I have no regrets about doing it. But in my case, I was a size K and likely would have gotten even bigger with more pregnancies. I had serious pain issues and, more importantly, couldn't do things like bathe my child, run around in the yard, carry her around, etc.
I don't know what your situation is, but I wouldn't recommend the surgery to anyone who wants children and is smaller than a DDD. Even those bigger than DDD, I'd only recommed it if you had significant pain issues. You CAN BF post surgery, but you should be prepared for one of the biggest struggles of your life.
I hope this helps.