I also avoid Umarex entirely. I borrowed a PPS last year and the quality and accuracy blew me away, enough so that I just ordered one finally last week. It was so easy to shoot with and the quality was so apparent.
Then I shot a friend's PK380.
Those guns should not both have the name Walther printed on them. I realize Umarex is the parent company but their product is considerably lower quality and they risk diluting the well-deserved reputation of Walther when they slap the name on any old thing.