Most large GEO's today still use purely analog repeaters. Having a true digital payload where we're doing digital signal processing on board the satellite is a significant step forward.
To get to the lower costs that we're aiming for, going to software defined radios was a necessary step. That's because it gives us the ability to build many satellites that are as identical as possible without hardwiring in the specific frequencies like they do with analog satellites today. It's hard to overstate the importance of that technology for what we're doing and the low cost targets we need to hit to get unconnected people online.