Do you, or have you, used Full-Duplex voice? What do you find are the advantages / disadvantages? Do you regularly use it? What gives Full-Duplex a "leg up" on half-duplex ham communications? I am not referring to satellite full-duplex use. I've noticed that there is a lot of "Full-Duplex" capabilities popping up the last few years in commercial communications, but none in ham...recently. I am aware of previous Full-Duplex ham models that were discontinued because they didn't sell very well (ex. Icom IC-W21AT, V21AT, etc., Icom IC-3210A, etc.) Is it worth the investment?