I bought the M&P 15 in December, just put a Vortex Strikefire Red Dot on it can't wait to shoot it. Maybe this weekend. The gun looks like it is a well made piece of equipment for the price I paid. I have 400 rounds in the waiting.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together. You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek