I used UBER cabs twice it is been just Good service from them. what I really do not like from UBER is their fare it is really higher side compare to other cab service and you need to wait for long time for taxi.
App is good but has small bugs like you can not track your taxi and if you are using for first time you may find some difficulties. but one thing I really like is their customer service you expect quick response from them. If they fix all these bugs it would e good for all.