I have to agree, we have no room to complain about these blades in any way because we are NOT using them for their intended purpose. Cutting carpet is not the same as cutting fabric. They may look the same and work the same but they may be inconsistent quality for cutting fabric and I think have the potential to damage our cutting mats over time. Compare it using a butter knife as a screwdriver. Sure it works in a pinch, is probably a lot cheaper then a screwdriver and can do just as good a job but eventually you are going to either ruin the butter knife, strip the screw or do both. It is no different then using fabric scissors for paper. Sure it works great but eventually the scissors will be unsuitable for cutting fabric.
That does not mean we can't use them if we are happy with the performance and willing to take the risk. But if they skip or if they ruin the mats there should be no complaining, whining carrying on etc because you are not using the product for it's intended purpose. Just my 0.02