... This weight savings has then been used to drastically increase the density of the core being used to manufacture the boats, significantly improve resistance to denting. The end result of this development is that we have created a hull that weighs the same as before but more stiff, and damage tolerant.
I've felt the difference between the two foam cores myself. Some development that went into the 2006 Blade F16 model were done here in the Netherlands. I can tell you that the difference is significant. Even the bare foam can't be dented without using a tool like a hammer. After adding the Kevlar (or glass) layer it should be more resistant still.
Vectorworks Marine made a good call here. They could have used the weight savings to produce a boat that would be under minimum class weight, but then you would just have to carry lead under the dolphinstriker to compensate. It is much better to use these weight savings to maximize abuse and dent resistance.
Wouter