I use this in a B4 with a losi 8.5 and it has been superb so far ( Touching something wood).
Word of warning though, the 70amp version does not come with a fan and it is quite large, also the wires for the capaciter are quite short, no serious problem just a bit of a pain.
If I had my choice again I think I'd get the 100amp version, but would'nt hesitate buying another if I needed to put one in a second car.
