There are 4 pieces to the Super Heavy Armor (SHA):
The armor itself (under-suit category), the helmet, the backpack, and the weapon (the HMG).

• The armor and the gun can be separated, although you need the SHA to use the gun.
• Useful tip: holster the SHA gun, then equip a smaller weapon to your hands and you'll be able to run faster, jump, and crouch. You'll need to drop the small gun to pull out the HMG.
• While the HMG is out, you won't be able to run, jump, or crouch.
• You can't lay down or go prone while the armor is equipped.
• The backpack is only used for HMG ammo.
• You cannot equip regular backpacks.
• The personal storage on the suit is small (1 med gun takes up 60% of the storage.
• The medgun can be used, but it requires heavily using your inventory window to switch back and forth. Medpens are the suggested method for healing. 13 would take up a little less than 60% of your storage. Most enemies carry them.
• Ammo clips for energy weapons typically take up less space than ballistics.
• You do not get major injuries as often while wearing the SHA.
• No EVA with this suit.
• Damage protection is at 90%
• Radiation protection is equivalent to Heavy Armor.

The HMG:

• At short range it's really good.
• At long range it can be difficult to hit your target.
• No delay for reloading as long as you have more mags on the backpack.
• You can fit 1 extra mag in your personal suit inventory.

Siege of Orison:

• Very effective for SoO.
• Be careful at end (admin), you'll need to holster the HMG to be able to jump across containers.

HMG vs Light fighters - Works, but not as effective as a railgun.