Have yet to encounter ANY issue with any ammo, of any kind, in my full size .40 M+P. I posted a 500 rd "poor boys" test on mine, here on the DRTV archives. No cleaning, no nothing for 500 rds. with a variety of ammo.
It just simply works.
If a "few", out of tens of thousands, come out not doing the same thing, S&W will stand by it and make it right.
Everytime I open my American Rifleman Mag, from the NRA, ANOTHER LEO agency has picked up the M+P...
No "kabooms" either...