NCSHP is experiencing some issues with 357 sig m&p's. The issues aren't documented well for the general public. "Ejection port issues." That's pretty vague. There's all sorts of internet buzz about it. Everything from ammo selection, 357 sig wearing down those silly plastic things, they never should have switched from sig sauer, operator error, blah, blah, blah. Who knows what the issues is, but they feel strongly enough that they are evaluating other models but not strongly enough to replace them immediately. Take that for what it's worth...which is not much.
I don't care to buy a 357 sig, but if I absolutely had to, I'd get a sig sauer. Honestly and straying off topic...I'd rather go with a 10mm. I like the heavier bullet and comparable velocities. As a matter of fact, I've been eyeing those rock island 10mm 1911's to experiment with.