I was looking into getting a .22 conversion kit too. BUT, the more I looked into them, the less I liked the idea. From what I have read, they are very finicky with the ammo they will work best with. The minute they get dirty you start having misfeeds and jams (like 1 in 10). The slide does not lock back on an empty mag. Out of necessity, meaning no recoil from the bullet, the slide is so light that it doesn't even come close to feeling like you are shooting the real thing.
For all those reasons, I decided to go with a designated .22. Not only that, but the resale value of a gun is a whole lot better than a conversion kit.
As a disclaimer, I KNOW that you can higher quality conversion kits that alleviate some of the problems mentioned above. But, IMHO the cost of them is so high it is not cost effective.