I use the non-e-bike version of these (socialbicycles.com) on a regular basis and it works quite well. Bikes have GPS, a GSM radio, and are geo-fenced, with a recovery fee charged if you lock outside the zone. My system is quasi-dock based with small geo-fenced hubs within the service area where locking is free, and a small fee ($1)for locking off-hub. People do free-lock or leave them in weird areas, but usually if they intend on using it again.
