Flew an RF5 (and an RF4) about 30 years ago from Biggin. I guess if you're asking they don't still have them there.
I had a Chipmunk conversion and found the RF5 easy to fly. Slow in roll, naturally, but otherwise responsive. Can't remember exact speeds but I did get a bit far down range once and had a long haul to get back to base against the wind. (Since my current mount is even slower I'd have to say "are you flying to get somewhere or because you want to spend the time doing it?) It was also slower to accelerate and climb.
Vis from the back was good enough, very good from the front. Grass landing was fine (One big wheel) and I never noticed any difference in flying a plywood plane.
Main benefit, at the time. It was cheaper to rent. Much cheaper.