Works great! In stock form it may be slightly "soft" and require you to fly it more on the wing. If you convert it to CDI ignition, it picks up a good amount of power and then it's more than enough. Still won't match the FG84 or FG90 combo for all out power and power-to-weight ratio however, but IMO there's less fiddling to get the 777 to work and balance properly if you are able to make or source your own 1" mounting block that is.