Yep, I've had them done. Had FOUR done (at the same time eep). The actual op was over 3 hours but didn't hurt and I had a video over my head to watch to distract me.
TBH with hindsight I don't think I needed four. I went in for one, possibly two and the dentist persuaded me I needed four to have a balanced bite. (And of course my embouchure is important). One of them sticks backwards in to my mouth quite a bit - I am used to it, but still wonder. (Yes of course I mentioned it and was told it was necessary to be that wide/deep for strength).
The key one, the one I actually went in for - the top bit broke off after about 3 years. I just typed tears. Freudian. It was replaced promptly, FOC. It;s now about 5-6 years. I would be able to tell you more precisely if my bloody email account hadn't thrown a wobbly on me which meant I had to delete all my old stuff. No other problems.
I had them done in UK and yes, eye watering. Just under £12k. I sort of regret having spent the money, even though I don't need it. It just seems a terrible extravagance in a world where people are starving. I wouldn't have liked to still have that gap at the front, though. And another part of me dreams that maybe I should have gone abroad, paid about the same, and had my whole upper set done so I'd have a stunning smile.
Part of my research involved talking to a dentist friend (who doesn't do them. She;s never learnt, and is close to retirement). She thinks they are (generally, not mine specifically) a real success story and will become much more common over the next few years - and cheaper.