Originally Posted by Old Fart
Dual power input RX solves one of the issues folks go to a Powerbox for - not all of them. If you get into GS planes like my buddy's 42% Giles - you have (3) servos per aileron, 2 for the elevators, THREE on the rudder

. But it does help with power redundancy.
Yup, in an earlier posting, one of my club members has a model with FOUR servos on the rudder alone. That model uses one of those powerboxes to handle the maize of servo connectors, what with rudder, elevators, ailerons, and flaps.
I think he has more in servos in that model than my $1000 Extra 330's total cost.