Re: Backward Roll - Risks and benefits
I was visiting a dojo in Canada once and was having trouble doing backward roles in a suave and sophisticated sort of way when one brown belt said loud enough for several people to hear - "you call that a black belt he can't even do a backward role".
The teacher (who at that time didn't know me from Adam) was pissed, and with his eyes gave me the go ahead. I knew exactly what he wanted. She did her role and half way through I was on top with a nice loud ki-ai.
The teacher trained for a couple of years with one of my sempai from Shodokan honbu - he knew my background and of course we had exchanged e-mails so it wasn't completely out of the blue.
A little story but the point is that I've never seen anyone able to do a backward role fast enough to beat rapid follow up by anyone with any training.