Aw Come On! Ruin the mats, how? I can't see how they can ruin a mat any more than any other brand. They just want to sell their expensive blades and make money. Truth be told, we just "might" find out the same company makes them for any number of brands and for HF too.
Those blades have to be sharp to cut carpet backing. Think about it.
I won't buy into that one. They are just upset because they can't find them and save some money!
June