Anecdotal, but I've used Car2Go extensively and HATED the smart cars. Always felt like they would fall apart the next time I accelerated.
Car2Go (Mercedes) merged with DriveNow (BMW) and are now called ShareNow. VW also runs a service called WeShare. Its somewhat successfull in Germany. I regularly use them in Berlin.
ShareNow also only uses VWs electric cara. Mostly last gen VW Golf-e but recently also some ID.3 cars.
Actually the Smart chasis is pretty well designed, like a roll cage with plastic panels. It would certainly not fall apart but feels that way because it's small, not very well sound proofed and they put the engine inside (!) the habitacle.
Car2Go (Mercedes) merged with DriveNow (BMW) and are now called ShareNow. VW also runs a service called WeShare. Its somewhat successfull in Germany. I regularly use them in Berlin.
ShareNow also only uses VWs electric cara. Mostly last gen VW Golf-e but recently also some ID.3 cars.