That's not too shabby a rifle. I'm not certain I'd prefer it over the 15-22 since it appears the stock is a fixed piece and the configuration offers less options than the 15-22. JMHO.
I think Bushmaster ARs are cream of the crop (I have one). I read about this rifle quite a while back. As I remember, it didn't quite live up to the Bushmaster reputation. I don't remember the particulars, but I'm pretty sure it was related to cycling issues-- big surprise
I handled several of these when they first came out maybe 6 or seven years ago. Trust me, S&W's version is very superior. They were neat enough but they are not in the same leauge as the 15-22 and they were a commercial flop as a result.