What kind of medic uses the Vita saw? It lowers your health and only has a use when you die. which is what you're trying to avoid. And 20% ubercharge doesn't mean ****** much.
I use the vita-saw with the vaccinator, the vaccinator's resistances and health recovery boost the survivability of a vita-saw equipped medic, and 20% is just 5% off one ubercharge from the vaccinator.