The new edition of the Asana Hero Highball has a hinge that I don't think is an improvement over the older taco style pad. Some people may prefer the hinge, but not me. They could have made a hybrid angled hinge or added at least some padding to the hinge area to take care of the bottoming out effect.
Other than that Asana has innovative designs and good overall workmanship and is made with quality materials. The padding on the older model wore out faster than most. Asana made an obvious design breakthrough when they made pull tabs on the ends of their straps. The handy pull tabs help you get a grip when the pad is packed full of gear and you need to tighten up the load for hauling (this is only really useful if you use your pad as a pack a lot). I also like how this pad has most of other needed features like secure shoulder straps and flaps to hold in stuff.