I moved your thread to the classifieds where it will get more attention.
I did read your ad and there are some things I would change. I would put the amount of days he was professionally trained and I would either explain the "simple vices" or remove the sentence altogether. When someone called, I would explain it then.
If I was considering the horse, I would wonder why the vices were not addressed if they were "simple to fix" since he was trained by a professional. I would also wonder what that professional actually did if the horse still needed work. I would like to know the temperament of the horse and how what discipline he was trained in - ie, trail, jumping, Western pleasure, etc.
What do you mean by needing "saddle work". Either explain or remove that sentence. If you mean that he is still a little green, that is a better way of saying it.
Just some points to mention to help your ad be a little more attractive.