There's a couple of these in Bodmin [0], Cornwall that I've driven through a few times. It used to be traffic lights and was constant jams at each junction. I'd never seen one before when they first changed it, I approached cautiously, drove onto it cautiously, and exited pretty impressed. I do wonder what less considerate drivers are like on it though. Local residents apparently complain about it [1], but then it seems to be part of the British psyche to complain about anything new and different, especially if it's done by your local council.
[0] https://maps.app.goo.gl/LQ9kSNZxQwYV8S9C9
[1] https://www.cornwalllive.com/news/cornwall-news/bodmin-round...