Decent but far too buggy.
Generally the app works and makes booking a cab easier but Ive had far too many issues booking, tracking and paying. I stopped using ecab+ (which allows you to pay through the app with credit card) because I was usually being asked for a signature from the driver and the confusion just robs the feature of any convenience it might add.
AGreenall about
eCab, the new taxi experience, v3.6