.Also it seems a bit unfair heavy + infinite 120 hp healths in arena gameplay almost gurantees everybody else to need a medic 
It'll be interesting to see how this plays out... I can imagine alot more heavies getting melee'd to death. 'course the real question is whether the health is gradual over the 4 seconds, or if it doesn't hit 'til the sandvich is finished.
I really want an unlimited sammich myself... maybe a never ending double grilled cheese...