I had it done, and I did breastfeed - not exclusively, but I was able to breastfeed and supplement. However, I had it done when I was 19, and had my first child at 31. When I had it done, they were still doing the full grafts of the nipple - and that’s what I had. It severed most of my milk ducts, and the only reason I suspect I was able to breastfeed my son was because they’d had enough time to grow back. (My midwife actually talked about it with me - she said that the longer after a reduction that one has children, the more time the ducts have time to regrow). Obviously, they hadn’t grown back completely, but I did have milk production (I did have low supply, and stopped breastfeeding about 4 months, but it was partly due to the low supply and partly due to my son’s reflux. If he hadn’t had reflux, I think we would have gone on much longer because the mechanics of nursing were easy for us.)
Now, had I known at the time that it would be an issue with future kids? I wouldn’t have had it done - but that’s because my plastic surgeon told me “Oh, you won’t be able to breastfeed with them that large anyway”, which, at 19, I believed. As I got older and closer to having kids, I realized he’d lied about that, probably not purposely, but just because that’s what he did think. I do wish I’d waited a few years so that the procedure had been refined a bit - now, it seems like it’s very possible to have it done and still breastfeed mostly normally.
We’re planning to have one more child, and after that, I may look into having it done again - having one child has caused them to grow too large, and I’m worried that a second kid is going to make them even worse. I do have back pain now, and am a DD (pre-child, I was a C), so I’m not worried to have the surgery again - if after a year or two, I’ve lost the baby weight and they haven’t gone back down to the C (or even a D I could handle), I’ll look into it again.
Long story short, the mechanics and results on my back pain? Great. I highly recommend it. The issues with breastfeeding? I would have researched it more and made a different decision, more than likely. But that was 15 years ago, and things have definitely changed.