If you're concerned about the robustness of the M&P 40, I can tell you it's pretty good. I have an M&P 40 compact, version 1.0. It is my everyday carry, and I practice with it a lot. It was flawless until it approached 10,000 rounds. It then began to have occasional light strikes. Smith & Wesson took it back and replaced every moving part except the extractor, at no charge. My 40c has since resumed its flawless performance, and it's currently approaching 13,000 rounds. I still carry it daily, which I would not do if there was the slightest hint of unreliability. If version 2.0 is built to the same standard, (and I can't imagine that it's not), robustness will not be an issue.

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What, me worry?