I looked at the Colt, the Sig and the M&P when deciding on a .22 in AR platform. The colt and Sig both felt nice...had some heft to them. My nephew has a Sig 522 and it is nice, shoots good but is picky. I went to A LOT of shops while researching what to get. I was told the Colt was the best one to get on several occasions...however, in hindsight, it was because it was the only AR style .22 they had to offer. When a shop is out of the M&P 15-22 the Colt seems like a decent product to move. Ultimately it came down to holing all three side-by-side playing with them. The M&P costs less and functions more lie a true AR then the Colt. It is easy to clean in the field and will devour whatever amo I feed it. Plus, it lighter so my son can shot it as well. Online reviews and my own personal experience all say S&W all the way! Just go buy it and start shooting...