no, i haven't run one, i used to have yoks though, and the YZ10 was a great car at the time, but the MX4 (which I had, it was poo) and everything after (apparently) have just not been competitive in the UK.
I won't say they are bad quailty, I agree yokomo are superbly finished and look great... shame the BX just doesn't go too well (again, from what I've heard, not from personal experience) and isn't strong, which is after all what this thread is about!

so how much have you run it then?