The S&W MP is a great concept. The gun has wonderful ergonomics, It feels great in the hand, is accurate, and is built in the USA, and comes with a lifetime warranty. They STILL have a problem with reliability as documented on the MP Forum. Problems with magazines dropping out at the wrong time, strikers breaking, a few instances of frames cracking, rust issues, and a few broken triggers, and other miscellaneous issues make it a nice range gun but not one I'm willing to stake my life on. I sold my MP40 and went back to my Glock 19's for a lightweight carry gun...I've never had a glitch with either one of them. When S&W gets the quality control issues resolved, I will buy another MP and give it an honest trial.
I like the concept very much.