I've used Car2Go on and off for a couple of years.
I've never used Zipcar, in large part because I know the round-trip requirement would limit my use of it to specific errands rather than place-to-place transportation, and there's no way I'm going to pay a monthly or yearly fee on top of hourly costs for something I'd use maybe once every few months.
I've never used Zipcar, in large part because I know the round-trip requirement would limit my use of it to specific errands rather than place-to-place transportation, and there's no way I'm going to pay a monthly or yearly fee on top of hourly costs for something I'd use maybe once every few months.