My only experience with Walther CS was when I needed a replacement rear sight on a PPK. "You know, we can mount that for you." said the Walther rep on the phone, and I said sure. Back very quickly nicely mounted by people who know what they are doing. I was impressed.

BTW, the PPX has a solid lock on the ugliest Walther prize. The pistol shoots beautifully and the trigger is really impressive, but the now-discontinued poor old PPX is, as my grandmother used to say, as "homely as a mud fence."