[rrritchey]

Hi,
Its really up to you but I feel you would get better response from your servos if you did use a PowerExpander or PowerSystem. One issue you have here is that two regulators can never be matched perfectly so you are drawing the majority of your power through one regulator. This causes more stress on that regulator because it will be hotter than the other most of the time. You also are probably going to see uneven battery draw, it might be slight (10%) or it could be sever (75%). The other issue is that you are loosing a lot of voltage through your Matchboxes when your servos want a lot of current. Your servos hanging off your Matchboxes might be seeing only 4.5V-5.0V when they want a couple amps of current during maneuvers where there is a lot of force on them . The advantage of a PowerSystem with built in servo matching is that each servo can have its own lead and this greatly increases voltage the servos see when drawing high current. On a PowerSystem you also get the regulator tied directly to the servo outputs, in your system you are going into the receiver bus through standard R/C connectors and dropping voltage across them at higher current loads before you even get to your receiver bus. This is all personal preference but I would not sell PowerExpanders and PowerSystems if I felt they did not add something to the performance of planes this size.