You should not have to treat your M&P like a diva. Anything made of steel is not completely rust proof, but the M&P should hold up well. As far as the stories about them rusting, I'd like to see where. One thing about them, or Glocks is that the internal parts are not coated with the the manufacters' anti corrosion stuff like the slides. Those parts will rust. Expose a Glock to something really caustic such as blood for an extended period of time and see how much damage it does to the springs and levers. They have to be replaced. I imagine the M&P's the same way. As long as you don't store it in a bucket of sea water and clean it once every couple of years whether it needs it or not, you should be good. A friend of mine who claimed he had exessively caustic sweat to go with his caustic personality swore up and down that any gun he carried in an IWB rusted, including a Glock, but I never saw any evidence of his claims.