this medigun could grant 2x healing rate, and 1.5x overheal build rate, while the overheal health fades away 50% slower speed. Ubercharge rate is 100% slower though, but 5% of the charge retains through death, and yes that stacks with the vita saw effect, while it also adds 5 health to the user, mostly making up for the loss of health for vita saw, making this a powerful vita saw companion. Ubercharge has its ups and downs, as when ubered it can target two teammates at a time, and gains 3x overheal build rate, and overheal is maxxed up to 3x normal health amount instead of 50%. But the medigun chooses the targets by itself during uber by ubering the two closest teammates. During uber, healing any lost health on teammates takes 50% longer, and the medic does not have heal passively during uber