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Bought two for use with my Kel-Tec Sub-2000 . Initially loaded them to 30 rnds and stored for a few days before I went to range, one with 115gr ball ammo and the other with 124gr jhp. Careful cause you can load past 32 rnds. Both ran flawlessly. Ran 100 rnds through each with one ftf. Also ran these through my M&P 9 and no problems there. Locks in properly and drops free every time. Will definitely pick up a few more now that I am confident in their function

yes they work fine

Yes, the upper geometry and magazine catch are the same as a standard size M&P Magazine with just a longer body.

Hi Nathan, yes it will. Here is Nathan Nathan video.youtube.com/watch?v=5iBpO5j7eks
Fits:
M&P9
M&P9C