My friend have recently purchased Gionee marathon M5 and he have faced many major problem and that can happen with you also.So I will mention all the major problem that he have faced!
1: The first major issue is heating issue.For eg: If you will play the game for half an hour continuous the phone will heat like oven.
2: It does not have NFC( Near field communication) .
3: For full charging of batter it will take nearly more then 7 hours.
4: Video quality of camera is not that good.
5: It also have wifi connectivity problems.
There are 5 major problems which my friend has faced.So with my opinion you can go for some different phone rather then this.Other, it is your choice you have to buy or not.