It seems to me the real benefit of adsb will come when gliders can have a sunlight-readable adsb-traffic display in the panel (I find ipad and iphone displays too hard to read in sunlight). I did find a European instrument that seems promising: its the Funke TM250. It seems to be a combined GPS, adsb-in receiver and panel-mounted traffic display for transponder, flarm and adsb targets. Price is about $1200. I'm not sure if its suitable for the USA, but it shows the sort of combined flarm/adsb plus display instruments that will be coming for gliding. This uncertain future path makes me hesitant to buy a TN72.