My dog loves them. When my family goes hunting, they'll actually save the racks and my dog will gnaw on chunks that are sawed off the rack.
Just be conscious of what kind of chewer your dog is. If he is a gnawer, like mine then he should be fine, but if he tries to split the antlers he may break or chip a tooth.
If you do decide to get him one or two, you can find them much cheaper on places like Etsy from people that either hunt or pick up the sheds and sell them much cheaper than a pet store.