SPAD's can be a lot of fun and I think the best combo by far is to build the smaller version and power them with a BB .46. Unfortunately they will not knife edge at all and have quite a few other quirks that make them anything but a true 3D airframe. Yes they will hover and IMO SPADS harrier better than anything else I have flown. While they can be a lot of fun they are not even in the same league as one of the .40 profiles.