I've only had one such, The Goose I think the name was, made from plans in RCM. A 40 size. I don't know if it was because of the design or if it is typical for forward sweep; but, it was very difficult to recover from a spin unless you had scads of altitude when you started the exit. That is what finally did it in, got to slow on the final turn on landing and it dropped off into a spin that I never recovered from. Roll rate was fantastic and general flight characteristics pretty good.