With apologies to Gleeful, I discovered that the Army-o'-Drones rigger can really throw a monkey-wrench into the game. Some issues I found:
1) Who can see what. Having a couple orbiting eyes in the sky passively observing is something easy for a GM to forget about; as a player I found I needed to keep that in mind to prevent an 'I would have seen that!' moment.
2) More than two drones involved in a combat situation can be... painful. For some players, it can be a belated discovery of overwhelming decisions to make. Not to mention, more combatants means combat takes longer.
Found this out while playing in a Missions game, and would really like to know what can be done to make the GM's life _much_ easier--aside, of course, from giving up some of my precious toys.