Been riding in one for or another for 17-18 years and never took the BRC, though often time consider taking it anyway (there's always something to be learned). I took plenty of spills on those dirtbikes of my youth though.
I took my riders test for my endorsement on a Kawasaki KZ400. It was a ratted out old garage sale find (literally bought for nothing) that my brothers and I terrorized mercilessly out in the countryside.
It was amusing to watch the guy on the sportbike and the one on the full dress Harley struggle with the test while my brothers and I zipped right through on the little KZ. Dodging trees at 40mph (on that KZ no less
) made weaving through a few cones a breeze. The right tool for the job makes all the difference (not the off-road ventures, the test
That little KZ convinced me, beyond a shadow of a doubt, that a cheap, lightweight, small displacement bike is not only ideal for learning on; they can be a heck of a lot of fun to boot.