I wanted C AND Ku all along and to be able to click on a channel and FTA receiver moves dish and I get a C or Ku channel.
But this was not possible (with most FTA receivers) until they recently came out with the BSC621-2 C/Ku LNBF. This controls polarity with 13/18 volts and works along with modern FTA receivers.
So now I can click on a C or Ku channel, dish moves to sat, correct LNB is switched to by diseq switch, and proper polarity is selected on the LNB with 13/18 volts on the coax cable.
And those who live in my house who are not "technical" can select a channel, then get it. No mess, no fuss!
So before people like me had Ku only. But with the BSC621-2, I have now added C band.