Rob I have plenty of experience with Leon's bows and little with Dick's longbow so perhaps someone can fill in the gap. If you look at the unstrung profile of the primal it would look like one of Leon's bows referred to as Reflex Deflex bow, you will see the profile on his site. Good cast, moderate speed and good shooter with just a small thump on release, excellent cast.
If you are comparing it to Leon's LS Slammer you get into a much more agressive reflex deflex limb design, more speed, zero handshock, and a highly shootable bow. You will see the difference in limb design both strung and unstrung. The grip on Leon's longbows are "killer" for sure. Goodluck. tom