I liked using ola its cheap and has a very nice driver - customer interaction with mobile location tracking which tells us where the driver currently is.
But the problem is when we are at locations like Airports, Railway Stations, and we have to order a cab then the cabs peak charges apply and the fairs get x3 higher so I recommend to use other options or to wait for some time. Apart from all this Ola is a very nice idea and is very useful.