I like that Halo did a little something different with the handle on the HFX as well, mixing materials to create a cork and foam combination. I actually like both cork and foam grips and think each work better in certain environments, so having a combination of the two is appealing to me. I just like the look of it as well.
Halo also left a little of the blank exposed behind the reel seat, which increases the sensitivity of the rod a good bit. This allows you to place your fingers directly on the blank when holding the rod and takes away the deadening effect that a traditional reel seat has when it covers the blank.