Sig makes a nice AR, but the optic is cheap. It will probably break easy, and/or might have issues holding a zero.
I purchased my Sig M400 from Walmart for several reasons. First the tools at a few of the LGSs either ignored me when I walked in, and when I was able to get them to acknowledge me they were pretty snobbish. As a customer who is wiling to drop a grand on a rifle a simple hello would be nice. I guess the color of my skin isn't the right color for some of the good ol boys in rural Georgia. At least the employees at Walmart's gun counter were polite, and I save myself over $200.00 on the rifle.