I've never run them, but HrdlyDangrs recommended them to someone here a few days ago... in regards to an old school look question. It might be worth sending him a PM since he's not here every day he may not see this therad.
I know by now Avon must have changed the formula on those things...at least I hope so! Looking at the tread pattern brought a chill to my spine. I had run the SMs (they called them "Safety Mileage"-I called them sado-masochistic!) back in the mid 70s-that was one scary tire! It had a 'squarer' profile than most tires and it gave the feeling of 'going up on an edge' in turns. Wet weather traction sucked...and on debris (sand, etc) they were positively evil. I was never so happy to put Dunlops on a bike in my life! Again, I hope Avon has changed the formula-but it still looks like the same tire.
To be fair to Avon (whose products I do like), I ran the Roadrunners in the 80s on the BMW and they were way better than the 'ContTwins'.