I've used the Dynafit PDG boot the last four seasons for ski-mountaineering racing, and finally decided to retire them and pick up the updated PDG 2. My immediate impression was that I love the additional toe box volume - the fit was comfortable out of the box, and I threw in a set of aftermarket footbeds to provide support and now the boots feel perfect. The overall design and style didn't change too much from the original PDG - I still love Dynafit's patented ski/walk throw mechanism, which makes transitioning a breeze. The full carbon cuff provides stiff lateral flex, and I feel confident when holding an edge at high speeds. The new Speed Nose does provide noticeable improvement when it comes to touring efficiency, as the toe-off when striding out is a bit snappier and quicker. Overall, awesome boots if you're looking to maximize uphill performance for fitness skinning or racining.