I don't know why they'd call it a "sharpened taper" because there isn't anything sharp about that. IMO, that's a stepped taper. Regardless, its a taper and the basics of why a taper works still applies. However, I would be doubtful of their claims until someone does an experiment to prove those claims. I think its a gimmicky and unnecessary version of a taper but to each his own and I could wrong... sometimes it's just a battle for differentiation, if it's something that grabs you, give it a go and experience it for yourself coz you'll never really know till you try it for yourself and have your own comparison with a regular taper...