That is a good looking tool. Im about done with those little fluid pumps and syringes. The MityVac plastic syringe is really great, far, far better than the cheap metal ones from the parts stores, but these things look much better for filling differentials and whatnot.
I dont like mixing fluids, so Id want one for MTF and one for diff fluid at minimum. Still becomes an expensive prospect when just servicing a few cars.