I'm yet to speak to a commercial GA pilot that doesn't think ADSB is great!!
About time the crappy 402s/barons/kingairs had there GPSs updated (huge increase in safety - has anyone ever enjoyed using a Trimble) and direct tracking becomes a breeze especially when diverting around weather.
And the fact that someone knows exactly where we are when flying across some of the most remote areas in the kimberley/territory is rather warming
If it wasn't mandated, the fact is no one would upgrade and in 20 years people will still be flying around invisible - sooner the better!