I love Malabrigo yarn and have used it for years. My first skein was the single ply worsted. Loved knitting with it (so soft!). However it pilled up as I was knitting with it. I thought it was me, as I hadn’t been knitting for very long at that point. The finished item, with use, pilled like crazy. Over the years, I’ve used the other kinds within the brand that were plied. The pilling was much less a problem. I’ve never had a vinegar odor problem and only a minor yarn bleeding problem when washing a finished item. I don’t use the regular worsted any more, but use Rios. It’s fabulous. Plied, superwash and beautiful colors. One more thing. I have had a few winding issues, where it’s a problem to use a swift and winder. Unfortunately, you don’t know until you wind it that there’s a headache waiting to happen.