Yeah, I was kind of bummed with the ones I bought too. They're not sharpened as finely as the ones made for quilting. I suppose they don't have to be with used on carpet. Mine kept skipping threads as well. I thought it was my cutting mat but as soon as I put in regular blades from Hancock Fabrics, everything went smooth as a hot knife through butter. I don't know if one of those sharpeners would bring them up to par for quilting or not. Seems like a big investment when you don't know if it'll work.