I am using 6V 2100 for the servos and a 4.8 1800 for the mx gear in my Tiporare, Mark. My dad lost six models to brown outs with his Extreme system last spring and it scared me. I use Airtronics except on the Kaos in St. Louis (72 Futaba), and have never experienced anything but great reception, but used the over kill method to avoid any problems (even the Kaos has a 6V 2100 back by the trailing edge!).
I noticed Rusty used 4.8 in his Blue Angel, I was suprised. Maybe I'm over reacting.
Chris...