Only place I’ve seen them and tried them was Longleat Center Parcs ~5 years ago, where they did staff lead taster sessions. I found it quite tricky, but improved a lot over the session, natural middle age cautiousness plus extra anxiety on a potentially quite unstable vehicle after my Xmas 2013 RTA.
Missed or more likely forgotten the cliff incident mentioned above!
I suspect the next plague will be e-scooters, depending on how this very low key legalisation of hire ones using the cycle lanes go. The one thing I don’t understand about them is why do so many scooters have very narrow foot platforms, that force you to contort your body to place one foot in front of the other… Widen the platform to ~30cm.