I have had the MP 15-22 for a couple of years. I haven't used my match Ruger 10-22 since I got it. Liked it so much I got an MP 15 Sport this year. The look and feel of the two rifles are pretty much the same. Main difference is $.03 per round vs $.40 which is quite a difference if you are just shooting paper or cans. Since I got the MP 15 Sport my Mini 14 has seen very little action. The only Problem I have encountered with either rifle is a walking hammer pin on the MP 15 Sport that was easily fixed by two drops of locktite. S&W sent me two new notched hammer pins that I have yet to use.
Both rifles are great and complement each other. Neither is match quality, but more than accurrate for my needs.