Not great -
Fit of the rods into the system is woeful. Yes it's has 17, 20 & 25° holders, but they have a good 2-3° wobble in them so it's more of a relative thing. Accurate it isn't. The coarser rods are not coarse enough. If your blade is properly blunt, start on something else. Whole system feels cheap. It may work on tickling bush knives but I am not impressed for use on fine kitchen or well honed knives.