My husband has used his a number of times and is pretty good at it. Not to say he couldn’t fall sometime but so far he has not. (Knock on wood!). I have ridden it around a few times as well and never fell, but most of the time when I rode it I was on some big cruise ship rushing back to my cabin for a sweater at dinner or something. Of course the surface was flat.
His has two wheels in the very front, although they are located right next to each other under the steering column area. Then he has one on each side of the back. It handles very well and is surprisingly stable. When a spot looks kind of tricky or has a big pothole, broken pavement or large bump, , he will usually get up and we move the scooter over the various spot ourselves. The good thing about his is if we get into an area where there are just so many tricky spots, we just fold it up and it rolls forward. Or I pick it up and carry it to a safe spot. It’s about the size of a medium rolling suitcase and we just have to roll it forward. There It is no telescopic handle, however, so it’s a little more tricky to try to pull it. Easier to just leave it standing straight up and roll it forward. It weighs 50 pounds. but 55 when the lithium battery is in it. A strong person could get it up stairs but otherwise it has to stay parked if dh wants go up some stairs. (Our son in law took it up a long, steep flight of stairs when we were in Mexico last year going to an upstairs restaurant.) Of course, we wouldn’t do that and would just leave it unless we were coming right back down the stairs in a minute or one of us stayed behind to watch it.
I have seen some silver colored, smaller travel scooters that fold up somewhat like a very large umbrella. However I don’t think they are even as stable as a three wheeler.
Of course, I realize that there are places where a scooter can’t be used. I’ve been told that at the world war Ii locations in Normandy there are many people who use wheelchairs and scooters and those sites are pretty friendly to such devices in those locations.