Are tailwheel checkouts required to be given in certified aircraft?
More specifically:

My dad has been teaching me to land our RV-6. I'm at the point where
I'm fully capable of landing it, and we were going to have one of his
friends (a CFI) go on a "checkride" of sorts with me to get the
endorsement. I wouldn't really be getting "instruction," and there
wouldn't be any compensation (monetary or otherwise). Is this legal?