I have the advantage arms conversion (standard model). It works ok now. At first I had issues with the last-shot hold-open feature (even with their slide stop), but they sent a replacement free of charge that works better (though not 100%). I've found it to be picky about ammo, and they do state that in the included documentation. Remington High Velocity Golden Bullet bricks are the cheapest I've found that work well, but I prefer CCI Mini-Mags, since they seem to burn cleaner.