BOTH (yes both) of my pairs of Jaywalkers have developed big honking holes in them. Seeing as though they were my favorites, I'm pretty bummed about it. Needless to say, I'm rethinking my "throw everything in the washer" method (except for socks made from Opal and their ilk, I have a pair that has lasted years and years with no pilling, holes, worn spots, nothing). The victims were made of Koigu and STR, which I know need more gentle attentions but I was unwilling to provide it. Lesson learned.
(As for darning? Just can't bring myself to do it, not to mention I lack matching yarn anyway!)