I was tempted to buy the Walther when I had been in the market for another 22 plinker, but its zinc-alloy slide was a major concern, especially on a gun which would see tens of thousands of rounds through it.
Don't get me wrong, I'm fine with zinc, just not on a plinker that would see that kind of round count. I have Hi Points and Heritage Rough Riders but they will never see the hi round counts like that of a 22 LR semi-auto plinker.
I went with the SR22 even though the slide is aluminum - still stronger than zinc.