I have my TWH stallion in a wonder bit hes doing well with it, and my quarter horse was also in one when i bought him at age 7 he has always neck reined and he is 17 now. Ive never had a problem, I wasnt aware that is was a more "harsh" bit, It was my understanding that the bit gives a horse a signal before tightening kind of to prepare them for stopping,turning,etc. But bits is someting i'm certainly no expert in, my exp. has been good with it, but i also have very light hands and min. contact with my horses mouth.