When I first saw them I thought: death trap...until I saw that video of one run into a K bar at 100 kph and you could still open the doors. I honestly don't think you'd be able to do that with my F150.....
BTW: an extremely rigid body isn't desired. One too stiff to absorb the impact would just transfer the energy to the occupants and kill them.
To answer the question: yes, I'd buy one for bombing around in the city in. Hell you can't beat the gas mileage and it'd beat the hell out of my 4 x 4 for trips to the grocery store.
I'd rather drive one of these just for the "cool" factor:
http://www.autobloggreen.com/2007/0...-design-and-build-100-mpg-three-wheeled-road/