The SphereBot, otherwise known as the Spherical All-Environment Robot Suit v12, achieves great speed and power, but at the cost of armor and durability. Optimal Pilot Specifications:

Spherical All-Environment Robot Suit wearers must possess or be programmed with great reflexes and a certain ignorance, or easy acceptance, of mortality.

Though fearsome in large numbers, Spherical All-Environment Robot Suits cannot match the superior firepower and armor of Warrior Battle Suits, which crush their smaller counterpart.

Google Frog: The loose storyline says that it's not a suit it's a robot.

Saktoth: Read the Story.