If you take all the worst things about a motorcycle... very dangerous, no storage, limited seating, relative discomfort, instability...
..and combine it with all the worst things about an automobile...price, inability to countersteer and lean, lack of maneuverability...
...You get a trike!
I think these things are really good devices to bring "motorcycling" to disabled people.
They are, however, exceptionally dangerous for anyone coming from a motorcycling background or anyone who thinks that it behaves like a motorcycle. I am not a fan.