I have no experience with it but SIG is a great brand and you won't be let down.
I'm gonna stop you right there, you just said an AR-15 is a high-powered rifle. It is obvious you don't know anything about guns and I shall ignore anything you say from this point on.
I had one for a while. It shot well for some of my friends but didn't fit my hand so I was always right of center. I had the 40 with and extra .357 sig barrel. The 357sig rounds were to expensive. I sold it to a friend and he has had no problems with it.