Drones are far too fragile. Ares Alpha with APDS will one-shot a Doberman, three Duelists, a rotodrone, and freak the technomancer standing next to the rigger's body when there's a sudden sizzle and smoke due to said rigger being jumped into the last. Even without the nice ammo, there's not enough dice pool to stay functioning after even one shot, with just one net hit.
That put me off playing a combat rigger. Might try again when Rigger 5 book comes out. You just can't make enough on Missions runs to cover that kind of loss rate.