Wiggy, yes, been there, done that CFS "low level intro", at 250 feet in the old Bulldog. My staff instructor watched me fly my "give back" to him then quietly asked what height we ex-Heli pilots were used to flying at. I correctly answered along the lines of "down to 50 feet agl, in training areas, and no minimum height if carrying out a concealed approach or departure". He politely asked if I would mind climbing a bit then, as he wasn't used to being that low. Oops! I'd been doing my stuff much lower than he was used to. I'd just gone down to what I felt was a comfortable height.