From a commercial standpoint yes, from a show ring standpoint not so much, unless you've got a nice wether to compete with.
We have a couple of couple of Spanish does- they're our best mothers and the easiest keepers in the group. They're also the wildest goats in the pasture though. We breed to fullblood boer bucks, and the kids turn out pretty nicely. The boer adds some mass and docility, while the Spanish adds hardiness that you just don't see as much in the fullblood kids.