A few basics I remember from when these first came out and a couple of friends that got them:
1. Clean, inspect and lube the gun out of the box and before first trip to the range. Make sure that it is all lubed as required before first use. I know I know, this is what we should do, but worth noting.
2. The inertia assist feels different, and it takes a little to get used to. Don't get lazy and forget to fully cycle the pump! One friend talked of short stroking his and not getting full ejection and/or release of next round from the magazine.
3. Reading both reviews and ratings on the gun, the first two points cover many issues, and the third is that manufacture and material flaws almost always show up in the first 100 shots. Like electronics, if this gun is going to break, it will happen right away. If a flaw doesn't show up early, it will be solid.
Those points made, I hear mostly good about the gun from friends that have it. Not enough negative or hate to say I would shy from it in any situation. As to issue #3, I always practice and teach that you run 100 rounds through a gun before considering it for self defense, and that the real testing doesn't start until you are past that.