Depends. For me, the .40 falls to #3 in my caliber preference behind 9mm and .45. For that M&P, you are looking at $399, plus shipping, plus FFL transfer fee, plus $160 for Apex kit. After all that, you are looking at likely over $600. If you are lacking in pistols, that might be worth it. If you are well stocked with pistols, then personally I would buy something that you are lacking. Money towards a AR/AK?.....more high cap mags?........spare parts kits?.......more ammo/reloading components?.......optics?