There are very few parts where even the best aluminum is better than some form of plastic... Integy has rather poor aluminum. It is not machined out of a solid chunk of aluminum, rather it is cast into the general shape and then finish machined to their specifications... giving it a billet look without the billet strength or expense on their end.
Common issues with aluminum parts is that they do not adsorb impact... they transfer it to another part causing it to break elsewhere. And when they do adsorb impact it usually means buying another part... where a plastic, like RPM arms for instance, would adsorb the impact unscathed.
There is a pin screw at the differential to remove and a pin at the wheel hex after the tire is removed. I was able to swap axles out without removing anything but the wheel.