I would rather get beat up than own another Super X II. If you buy the Super X II the biggest thing is keeping it spotless. As long as it's spotless it should be fine. If it gets the least bit dirty it will jam for sure. If you start having problems you need to check the plunger in the back. They are nortorious for getting a little dirty and then jamming. I would try and get a used Benelli or a Beretta and you will be much happier. Benelli first and Beretta second.
The Benelli is inertia powered and not gas powered and therefore much easier to clean. It is also less likely to jam if a little dirty.
Good luck with whatever you choose.