I chose this app because I am using this since very long time and I feel that its very good website they have to improve their application of windows phone and some other feature like performance of website.
BEST- faster I found it very fast as compare of other similar application and websites and and recharges and mobile offers are updated all time .
WORST- nothing is worst but some of windows phone app have little problems which is that I cant find adding amount in wallet option.
its a very good website but need more improvements and add more feature because as compare to other smiler apps they are growing and expending to other features.