As gcreek suggested, I do have an opinion on Hancock horses but can really only comment on the line that we had, which was linebred Hancock, Leo and Grey Badger. Neither the stud or any of the 8 or 10 colts that I rode had the slightest buck in them. We kind of got away from those horses to more popular cowhorse bloodlines and I haven't been as well mounted since. They were tough and cowy and could travel. I've seen others though, that are so hard to the Hancock that they can get a bit heavy footed for my taste. I haven't ridden any Blue Valentines but would like to try some sometime. Anyway that's my two cents worth.