*really* hard to find this information as of yet... but from what I've gathered..
Armormech makes armor, but the armor is at most on-par with gear you obtain as drops from Operations...
Armstech does the same deal with Weapons, for instance -- Barrels for weapons.. Can be on-par, but can not provide a benefit...
Biochem, which appears yo be unusual for the pack.. provides Increased / Better stims then other versions you can buy/trade/obtain... They also provide "limit-less" versions which mean you don't have to farm between raids for stims and medpacks..
Cybertech adds in grenades, which is at least an extra CD to throw around that doesn't use your primary resource (rage/energy/etc)
So.. My question is simply.. Why go with Armormech or Armstech if they provide no net benefit (they might make great money-makers for alts, or for making companion gear though)
I'm looking for someone to refute or confirm what I've heard -- I'm not sure this is exactly the case and I don't know anyone that played high level SWTOR Beta