For those of you guys who think that they do not go dull or need sharpening, you would be AMAZED. If you could pick up a saw with a fresh blade on it, you would love it and see the difference. The thing about it, is that you don't really notice the dulling because it is so gradual. I used to think the same thing, until mine got real dull eventually. I then sharpened them. After that, I learned how beneficial it is to keep them sharpened regularly. They cut cleaner, more precise, easier, and faster. Of course, this is based on proper running procedure - not revving them and keeping the saw running at about 1/4 throttle.