Crap-o-la
The app doesnt always work to unlock the car and drive. I was stranded in a small town for 6 hours and had to wait for a service guy twice and be towed back to NYC. And then zipcar said they would only refund me for half the cost of the reservation because I was able to drive the car to my destination, just not back home. Total crap.
Bat yo about
Zipcar: cars on-demand, v4.0.14