I am using marathon m3 from past 1 year. Its price is bit costlier than other mobiles for 1 GB ram. Multiple tasking is not so good. This mobile is very heavy so think before you buy it.
The only positive aspect if this phone is its 5000 may battery
Gionee should have given a charger of at least 3 amps
Kindly reduce rhe weight of this mobile and increase its RAM. charger quality is also yo be improved.
Please dont buy this phone if you are looking for battery only. Go for some other phones because 12500 is huge money.