I have both the M&P 340 and the 340 PD. I also have the 640-1 and the 640-1 Pro Series. The scandium framed guns are naturally going to have more recoil than the stainless steel framed guns that have twice the weight. But, they are manageable, and are a joy to carry, which means that you will have one with you, which, after all is the most important thing. My 340 PD is in my pocket as I write this.
Can you tell that I like the Centennial guns? Here are some of mine:
Best Regards, Les