I have a BM42S that SN7 sent back for Lifesharp service. BM just put the whole blade through the sharpener and pretty much flattened most of the serrations. They still work, but barely, and only using a rat-tail file and the serration hones from DMT was I able to get most of it back. Looks ugly regardless. Yes, it's not fair to limit the service, but just consider it good incentive to learn how to sharpen you own knives.