I have a ciener for my Kimber Custom II, and I love it. Rather than shooting 100 rds of .45 and going home unfulfilled, I can shoot .22 until my hand gets tired.
However, it's not literally as cheap as the ads claim. If you use the cheapest .22 ammo, you won't get great reliability. Remember, most .22 autos only cycle a bolt, not an entire slide. It's more work, even if it's a really lightweight slide. Use stingers or velocitors. Also, my kit took a few hundred rounds to break in, and it stars to FTE every couple of hundred rounds, so I have to give it a shot of spray cleaner and a quick wipe to keep going.
I had the Advantage Arms kit for my Glock, and it was good, but a little more tempermental, and even lighter. An aluminum slide on a 1911 is pretty lightweight, aluminum topping a Glock REALLY feels like a toy.