I wouldn't recommend this tool only because i am currently 8th prestige and tried to get to 9th, Did everything legit, worked out the score i would need and calculated everything and then 30mins later, Reset. I wouldn't bring out a tool if it wasn't flawless. These resets could turn into Bans one day.
It is not the tools fault, it's just that the CoD online system detects the changes. You must absolutely make minuscule changes every once in a while and you will be fine.