Patrice,
Sounds like good advice. I have never cut that many layers of fabric. Well that I know of. No, I think I usually stick to 4-6 tops. But then I am one of those people who will use that blade until it's not fit to cut anything but a piece of paper. Then I simply label it "paper only" and move on. I bought one of those blue sharpeners, but never found any value in it at all. Maybe because I assumed it didn't take a marathon work out. I thought it was more like a scissor or knife sharpener. 3 minutes and done. Guess not... I think I've already labelled it garbage and tossed it. This unit looks good.
Gotta ask, how on earth can you tell how many layers you have left? Are you using a magnifying glass? Can you actually see that?