>>2012275They're good for making pedestrian routes go faster, fitting on public transport, and allowing you to include SOME regular roads in your routes without having to use public transport. Issues include:
To stop you have to get off and walk, and if you're not smooth about grabbing the handle expect to drop it a lot. This also means that unless your unicycle is so tall you can sit on it with one foot on the ground (and thus it'll take up a whole seat on public transportation) you must have one hand free if you want to stop.
Wheels that can go over 40 MPH are bigger and harder to ignore if you take them on public transportation.
Going faster than your legs can move requires a face enclosing helmet.
Hit the never exceed speed and you'll face plant. There's just no designing around it.
You can keep up with the cars on acceleration, but occasionally one particularly stupid driver might not really acknowledge that you're even there without wearing high visibility clothing.
Because you'll be taking pedestrian routes it doesn't take much more effort for a robber to rob you.
There's not a lot of places to put the thing, and your helmet, once you get to your destination, although some designs can allow you to put it in a bike rack, which will be fine as long as there aren't too many bikes around. These are still a very strange sight, so expect to ask permission to take it in every time you go somewhere new to it. Since you have to lean to turn they can't make one that just follows you around.
Because they're unusual don't expect a GPS app to consider everywhere you can actually go with one and all the roads you can't use.
Oh and I think most of them require a phone app somehow.
