I think the Doroco blades are really for very light growth or fine hair. Which is probably why they work just fine for me I shave my head daily so there is never more than a millimeter of two of growth, and my hair is pretty fine and not dense at all. I'll probably stay away from the super aggressive blades.
Just borrowed one the these from my buddy. He saw the commercial and bought it. He hates it and went back to his electric haha. I'll post reviews in a few days !!!