I used to have two. Adopted them at the same time - the big black one was the one I wanted and the little bay came along as his buddy. The big black we named Dante and unfortunately lost him a couple months after we adopted him to colic. I was extremely tore up especially when he was gentling down so quickly.
The little bay, Bandit, was much wilder even though he was younger and took longer to bring around. He was about the same height as my haflinger, but more narrow so I was worried about my size versus his and found him a home with a smaller lady who had been searching for a while for a mustang.
I think someday I may give mustangs a try again, though I think after how long it took Bandit to gentle down, I would adopt a weanling or yearling for my next one.