I use the extinguishers and I love mine more than several fine wood custom grunts I had made.
with mine though I just found that perfect sweet spot grunt sound, a younger buck nose to the ground muffled sounding tone,,, works perfect for our deer here last 7 I taken where all bucks and I use that call religously,,, But not like the hunters on TV I just do a single very short light sounding grunt every 20-30 minutes while I'm in the stand, a social grunt you could say which brings mostly mid sized spike to 6 point bucks in for me very casually it just lets em know theres others around and its safe over there.
the one thing I always heard bad about the extinguisher was they come apart accidently and then you lose the O-ring because it pops right off once they come apart,, its VERY TRUE it will happen sooner or later,, but based on how I see the deer react in my woods I found that perfect sweet spot in this call then I took camo hockey tape and covered the whole call so it can't adjust anymore,, its stiff enough where I keep it right in my lacross or muck boot.
as far as other grunts which work for different people,,,,,,, judging them during the rut period we all know that any grunt call no matter how awful or sweet it sounds, snoring, even nose grunting (cuping your nose and making pig sounds use by many selfbow folks) ALL bring Bucks running during the rut.. BUT when you consistantly bring in non rutting deer during non rut periods is what makes a special call,, my call may not be fully there yet but man am I impressed with that one tone I locked it on to.
seriously if anyone has one they don't use even if its missing the O-ring Please PM me I'm looking for more of these ASAP.