The exodus of exoskeletons makes very little sense to me.
The Iron Will appears to be possibly mechanical powered, it simply amplifies movements from the user. The text doesn't make any mention of power or fueled needed for operation. Which could explain its lower base cost 3400. Then make then make a armor modification of rating 12 to it for 2400(a 6R). For 5600 you looking at having a 16, base of 4, hardened armor, 1 agility and 8 strength. That makes a person about unstoppable, short of magic and really big guns. But admittedly the user is going to have trouble hitting things in combat. For another 4000 you get a reinforced weapon mount. You can then mount and use a gatling modified heavy machine gun on full auto, 250 rounds in store, with no recoil due to it being vehicle mounted. A -14 to dodge pool should help a person hit things.
Looking heavy combat armor with helm is 18/16 for 30,000(20F) unmodified. Cyberware is at least 15,000 a limb and cut into the essence. Neither saves a person from stun damage. Iron Will seems very cost effective, cheaper and better. The Iron Will is 50 years old. I would a think that a modern exoskeleton have even more armor and a internal power source that help removes the agility penalty. And start around 20,000 the price of mid range car.