Agreed- post this in the driving section of the forum and no, they are not good for training for the reason Mary Lou lists. I will use mine as a set of training shafts on wheels for my green horse, but I will not try driving him in it until he is a solid driving horse with an iron-clad "Whoa" and good manners.
I do love mine though, and when you want one you can get it from Bob Graham at Graham Carriage Works in Oregon.