Keep in mind 22mag ammo is $0.26 a round. That 22lr is $0.06, you can burn money a lot faster with that semi auto 22mag. I can't speak from first hand experience because I backed away from the semi auto mag and stuck with my bolt but I heard some about some cycling issues, take that for what you paid for it. There is a reason Ruger discontinued the 10/22mag.
I have more .22 WMR than I will shoot in my lifetime. I think a .22 WMR upper is a great idea.