Depends in my opinion. With 1911s, Glock, MP, and Beretta 92s I could always get the slide to go home with a round chambered with 100% consistency. For a gaming gun, I love it.
With my recent move to classic Sigs- I've been able to get the slide home once in a reload, and it was an EMPTY chamber. No bueno for a carry gun unless it's a mechanically controlled function if you ask me (which hasn't been mass produced successfully to my knowledge).
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My experience with the M&P in USPSA is that mags downloaded to ten rounds would nosedive fail to feed if seated hard enough to slam charge the gun.
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