yes, the blades seem to dull quicker than they used to (even though I've been quilting for less than 8 years). I get annoyed at those threads that seem to hang on for dear life after a cut. Maybe I change the blade too often. I save my old blades for my kitchen rotary cutter (plastic bags, netting on onion bags etc.) and put some used ones into a plastic box thinking that one day I'm going to get a sharpener.