I owned both and I sold the M&P. I like my SP-01 Shadow much better for a few reasons. First I will say, the M&P was a reliable, well built, and comfortable gun but, first, it wasnt overly accurate compared to the Shadow, two, it has a terrible trigger compared to the Shadow(and yes I knew about the Apex kit but, we are talking stock guns here), three, I had a problem with my thumb position not allowing the slide to lock back on the last round which I have never had on any other handgun, and four, the mags would not go in the gun with 10 rounds in them and the slide closed(a major problem for competative shooting which I do). My Shadow on the other hand has been flawless. The only problem I have ever had with it is the rear sight came loose. It is easy to see why the Shadow is so popular. Like someone else said here though, you are comparing apples to oranges. SA striker fired polymer frame vs SA/DA hammer fired all steel. They were built for a different purpose and are in a different price range. The Shadow is $150-200 more.