I had one with just the single arm. It used to nip sometimes and eventually it broke. Also have one with the double arms. You want to watch the firing pin protrusion on the older models. The single arm shotgun fired out of battery while my brother was using it. Scared the crap out of him and did a little damage to the chamber, but it held together. Gunsmith checked it out, fixed the firing pin problem and okayed the gun for continued use. However, I never really trusted it after that.
The newer, double arm shotgun seems to be much better made. I use it as a "loaner" when friends, acquaintances, etc...are in need of a shotgun and forgot their own.
I've hunted with both of them and killed a number of ducks and bunnys with them, however, if my budget could afford it, I'd definitely buy better. Thankfully, my budget does so. I usually hunt with either my Fox SxS, Remington 870s, 1100, 11-87 or Benelli, depending on the game I'm after. I use the Fox chambered in .410 almost exclusively for bunny hunting, while the Remington 870 & Benelli semi see the most use for waterfowl, both fresh and sal####er types.