Pretty decent
Ive used the app 4 times - 3 perfect rides, and one cancellation (the cab drove around and couldnt find me for some reason) that I wasnt charged for. Only major issue is that the app says that the cab has arrived before it actually does (usually about 5 minutes off) and standing in the rain is pretty annoying.
Vancouver-cab-user about
eCab, the new taxi experience, v3.3.2