A friend of mine who is a professional Wolf Hunting Guide, swears by Fox Pro. He has been invited to the factory and given tours. Also has had visits from company execs here in Alaska. He uses Fox Pro exclusively. He is mentioned in the Wolf Hunting article in this months Fur-Fish and Game.
I have an old one, I've had seven or eight years. Got damaged two years ago. I am sending it back for repairs and to have new sounds put in. Sounds they did not have when I bought it.