I still use them. I have owned a standard, Twelvette and a Twentyweight. They are recoil operated but the barrel moves only a fraction of an inch rather than the full length of the ejection port as the A5 does. They operate reliably if you don't over lubricate the bolt, rails, etc. Too much lube and the bolt will operate so quickly that it catches the empty as it is ejected. The instructions says it was lubricated at the factory and shouldn't be lubricated further. There are some parts available from independent parts suppliers but barrels, stocks and forearms are somewhat scarce. I have never needed any mechanical parts. Recoil of the double auto is a matter of perception. I never found any of them to have objectionable recoil with reasonable field loads. Of course I was not shooting it pre-mounted. I wouldn't recommend 2 3/4 magnums.