The Accu reel blades are unique. The reel blades miss the bedknife by .05mm, which is why the blades cut better and rarely need sharpening. On most other models the reel blades make contact with the bedknife which explains why other push reel mowers need frequent sharpening. And of course all rotary blades need to sharpened regularly.
In short, lifetime precision cutting with no hassle, sharpening cost, or repair shop time!