RE: hpi flux reload v2 ?
from what I read the flux reload v2 is just a rebranded hobby wing 60A ESC (probably would be cheaper to get the hobbywing) with a different case, and seems sealed a little better to make it waterproof.
The HW 60A is a good ESC I own a few. Will say not sure if it could handle the 4 pole motor as those put a lot of stress on ESC's.