Got my Tenacious and have carried it since the beginning of May. Best stainless knife I have ever owned. I work in a warehouse, and carry the knife everyday, and have used the knife to cut shrink wrap, card board, food, banding material, and wood for the last two months. I have only had to touch up the edge on a steel a few times and used the finest stone on a Spyderco Sharpmaker twice since getting the knife and the knife is still shaving sharp. In general most stainless steel knives, inlcuding AUS 8A, ATS34, VG-10, etc. hold their edge about 2 weeks before becoming as sharp as a dull butter knife and needing significant sharpening.