Hi steve
I have the fox pro fury - fully loaded, has been of good use to me, sometimes it turns a mediocre night into a brilliant one.
Wouldnt say they are 100% all the time, sometimes old Charlie wouldn't turn his head for a chicken let alone a call.
Mine has proved itself time and time again, it's a decent bit of kit, I probably use a dozen of the calls regularly and have had to mute the caller to stop the fox chewing on it on several occasions.
204 ruger is the guy to talk to.
Make sure you take the batteries out every time and get the best 2.3k lithium rechargeables and you won't go wrong.
It is a decent bit of kit, just depends on the calls you want on the machine really for choice wise
Atb
Phil