Got myself this little guy, yes, it is expansive but it is really worth the price.
With that, is there any news on selling the fast/super pack separately from the new VF-1S?
They've added/improved several paint apps (grey goggles, UN Spacy and aircraft numbers on the legs, landing lights now use a metallic paint etc.) as well as making some minor mold modifications (most noticeable is a removable nose cone in order to accommodate the GBP's crotch armor).
Bandai actually did add a tiny bit more metal; the swing-out hinges that the shoulders attach to are now diecast metal. The hinges worked just fine as plastic on the older releases so it's kinda superfluous, but it does add some weight to the figure which is nice.
It's primarily a transformation component, and everything that's connected to it is still plastic so there's no metal-on-metal joints (nor is there a great deal of weight placed on this point), so it should hold up.
One of my favorite things about the Hi-Metal R release is actually how much tighter all the joints are than the older releases. Even fresh out of the box my Hi-Metal Roy VF-1S had some loose areas, particularly the hips. The GBP VF-1J's hips on the other hand are super solid.