The thing about the Sharpmaker is that you get 20º and 30º and that's it. If you have an S30V or other super steel blades that takes a more acute edge, you just can't get them. A 20º sharpening edge is fine for a 440A, 440C, or AUS8 knife blade; however, an S30V blade might be happier with a 17º or even 15º edge, and the Sharpmaker just won't deliver those edges. And since the rods aren't round, you can't even drill a block of wood with new angles.
Sal Glesser should sell plastic sleeves with 20º and 30º on one side and 15º and 20º on the other. Then users could just flip them. We're rapidly moving into a new era of blade steels and Spyderco should take the Sharpmaker into that era and not stick everyone with a 20º angle. (I don't even use the 30º, though I'm sure many do.)