I have a Walther P22. I have a love/hate relationship with it. I have about 10,000 rounds through it. At 3,000 rounds I had to send it to Smith and Wesson to replace the extractor. It is a good training analogue, and it is hard to be upset when it has done as well as it has over this period of time. However, it isn't really a Walther. It is an Umarex gun with Walther's name on it.
If I were going to recommend a 22 pistol it would always be the Ruger Mk III which I own, or the Browning Buckmark, which I have shot extensively. They are the two best offerings unless you start talking about high end target pistols.