If you're already an M&P shooter, you get mag compatibility with your pistol, and since it's a side-folder, you don't have to worry about optics ruining its stowability.
MSRP is supposed to be $659, so that would put street prices probably somewhere in the mid-high fives? If build quality is good, it might be worth a look if I were still rockin' an M&P 9 pistol.