I've had QH's off the track but no TB's personally. I have, however, worked with quite a few OTTB's at the barn.
Most of them really aren't very bad. Difficult, a little hot, but all in all pretty willing and athletic animals.
We did have one or two though that have been absolutely off their rockers. They were hard to get turn into reliable horses. However, in the end, one went to become an excellent barrel horse for her experienced owner and the colt went to a three day eventing barn. I'm not entirely sure if he competed or not but they seemed real excited about him.
I do prefer Appendix QH's though, especially in my line of expertise which is barrel racing, cowhorse, reining, etc. I love the speed they have while sprinting.
Pssh.I didn't pick up the wrong lead
It's called a counter canter...
...A very advanced maneuver.