I have one, and they can be a little finicky. I would get in trouble by using too much oil. My A5 seems happiest running almost dry.
Because they use a brake band and a spring clip to control the eject cycle, you set them up for one kind of ammo you plan on using that day -- ie light field loads *or* max power turkey loads -- but you can't mix ammo types like you can with a gas operated reloading system.
There's a bronze brakeband ring that rides outside of the magazine. That ring has a flat end and a tapered end. There's also a washer underneath the bronze ring, and it also has a flat and a beveled side. For high power loads, the brake band is mounted with the tapered end forward, so as the barrell begins its backwards travel, the bevel on the circular extension on the barrell bottom comes down over the end of the bronze ring and squeezes it a bit tighter. The washer is also installed with its bevel end pointing towards the brake band. The result is when set up this way, the brake band gets an additional squeeze from both ends and slows the reloading action by a lot. This means low recoil ammo won't cycle because there's too much friction.
Conversely, for light loads, the bronze brake band is mounted with the flat end forward and the washer underneath with it's flat end foward. During the recoil, the brake band meets the barrell extension and the washer beneath flat-on, so there's no additional friction dveloped by squeezing the ends of the brake band -- only the friction developed by the circular clip spring that surrounds the bronze brake band. So what this means, if you've set up for light loads, hi-power loads will eject with w-a-y too much enthusiasm! Pounds the hell out of the mechanism.
Like I said, a little more fussy, but the mechanism is utter simplicity.