"I have no experience with ATI, but from what i have heard...Stay away from them! THe adapters cause the stock to wiggle, and are just one more thing that can break. Whatever can go wrong will go wrong."
No, I respectfully disagree. My best friend and I both have Defenders, his has the top-folder by ATI, and he has put more lead through that gun than a small smelting plant. The ATIs do loosen over time, but only until they reach a sort of break-in point, and then they stay there FOREVER.
Pinepig-If you truly don't like the stock, by all means send it back. But bear in mind that it IS a folding stock. If they were meant to be comfortable they would come with aspirin. My buddie loves his, but the choice is yours. Hope this helps!