Been curious about this one as well. But, like with most new Ruger stuff, finding one in a store=snowballs'
chance in Hell. And when you do, -at least around here, anyway- expect it to be about $200+ above MSRP.
The one or two reviews I have read of it, havent been terribly good. But, I take those with a grain of salt- I want to see one for myself.
Either way, I have a hard time considering .22 pistols that cost as much-or nearly- as my .45. No matter who makes em, or how well they may be made.
One possible exception being that new Judge .22/.22MAG . Checked one of those out the other day, locally- very sweet- and you have the option of both rounds.
As for equating .22 practice, with whatever you normally carry-= to a point, maybe, but it doesnt simulate recoil/blast effects and eventual fatigue that you get with the real thing. I consider .22 practice it's own thing, and practice with the actual carry arms something entirely seprate.