You know, they all work. I really like the psycho tweety. But I have a really old primos regulator that has produced well. The LIL dog is good by primos. Unlike gearhead I don't like circe myself. I think it's just a personal thing. My buddy uses one and it produces though and they are easy to blow. I also like the custom jobs by the independent guys, I've one a couple from a guy out of Texas. I'm gonna try a few from makers on this site hopefully this winter. They sure are purdy too. If you're new to the sport buy one that comes with a dvd or a cd and get to practicing.
I'll give you a hint............... learn to howl.