Beware of overcharges!
The software doesn't always work properly resulting in dramatic overcharges.
We rented two bikes on two credit cards. It seemed very straightforward. Each time we returned a bike we made sure the green light came on to confirm that the bike was returned. At one point my wife was unable to take another bike since the kiosk said that there was already a bike out. This was NOT the case. When the credit card bill came we were charged $35 instead of $7.
The customer service by phone is terrible. After explaining the problem we had they basically said "tough".