For shotgun sports, there are so many variables that affect pattern. Muller seems to have a cult like following, mostly I think because these folks have to justify what they have spent on them.
They pattern well, as do many other makers chokes. Factory chokes pattern well too, so it really pays to pattern your shotgun with various chokes and see which ones perform best. Unfortunately on any different day, you can still get different results because of variables like wind, heat, humidity etc.
For turkey hunting, like I said before, stick with the known brands. For clay shooting, Mullers are fine, but so are Briley and Carlson's, Trulock, factory etc.
The reason I don't recommend Mullers is because I had one fail at a time when it was well known that a certain shotgun brand was having issues with one of those chokes and I had a horrible customer service issue getting it resolved. Luckily a gunsmith was finally able to remove the damaged choke, I went back to the factory choke and realized I actually had better hits with my factory choke.
My turkey guns are dedicated for that purpose. And so I use dedicated chokes for them. I have Rhino, Trulock, Sumtoy, Hevi, Carlson's, SSX, titewad, and Indian creek tubes and they all pattern great and see no reason to experiment with an unknown. I hope this helps...Crusty
