All right, I'm going to post this from a different perspective when we talk use case, realizing RokSlide is oriented on the Western Backcountry Hunter. Take a look at RokMan from the point of a pack that serves a backcountry fisherman, rafting, or better yet expeditions to remote and wet parts of the world (there's a joke there somewhere). In that lens they may have hit a home run (I acknowledge heavy). As far as expense goes take a look at Arcteryx LEAF, Watershed OTB Products, Halite Fenris, etc and you see it's not unreal (I quoted the Kifaru line with similiar specs and reached $1200 very quickly). The fact that ROKMAN incorporated TIZIP and true waterproof abilities into a load carriage package is unique not only among the backcountry world but expedition packs writ large (when I write expedition I'm not talking thru-hiking, I'm talking I rely on my gear to arrive dry or I'm in hypothermic situation). Honestly, it potentially competes with the best of maritime expedition products (LEAF, Watershed OTB). When we look at the weight of the Core Flex Harness with the 5000 Cu In bag we are talking 7.7 Lbs, this is in line with the Kifaru Tactical Duplex and Muskeg 5000 (one of their lighter packs) at 6.6 Lbs. Add a real dry bag (submersible) and you are close to a net gain with RokMan.
That said, the RokMan Frame I am skeptical off, though Randy's review highlights it's use, the design could be shorter to avoid brush and used as an attachment point for various bags similiar to Exo Mtn Gear. BL - its potentially one of the best integrated backcountry packs when water and cold are staples of the environement (they often are); add an oral inflation valve and kill the fact you get (3) nose hole items carriers with the whole kit (Frame, Pinnacle 5000, Pinnacle 2500) and you have a winner.