I can't really say what the exact numbers should be. You tell me. But here is what I'm thinking.

Pros:
Increased Push Force on enemies.
Increased Damage Resistance While Spun Up.
Healing from Dispensers and Mediguns heal faster (Health Packs heal the same amount.)

Cons:
Unspinning takes a long time
(I can't decide between these two so you guys can choose) Increased Ammo Consumption or Slower Firing Speed.