Well, as you can see, we changed them completely from the Hardrock '08 and previous models. There was actually debate as to whether we change the name. We didn't and I think that is okay due to where the shoes sits in our line as a whole. The goal with the Hardrock '09 was to make the shoe lighter, faster, stronger, and more stable than previous versions and we have done that on all levels. The shoe weighs just 11.8 oz. (size 9) which is lighter than the previous version. Stability-wise, your foot sits down in the midsole, closer to the trail, utilizing a technology we call 'Perimeter' where your foot is literally cradled by the midsole on all sides. This is very noticeable on the trail when making quick direction changes and in un-even terrain. The shoe is posted medially, which is hard to tell from the pictures, for those who pronate and need extra support in that way. From a protective standpoint, we use something called 'Trailshield' which is a protective plate incorporated into the midsole that is composed of non-expanded EVA. This material is much lighter than the PU plates we have used in the past and still offers a ton of protection. The positioning of the Trailshield within the shoe also has a part in creating the flex and torsional characteristics that make this shoe what it is. As you can tell, there is allot going on with these shoes in a lighter and more stable package than previous models. I hope all this info helps and I hope folks get them on the trails soon!