Fantastic is:
Flying from Newman to Perth, normally only "identified" about 2 hours into a 3 hour flight, with ADSB identified all the way.
Out side of RADAR, when in range of the ever increasing number of ADSB stations, ASA can see you.
With ADSB-IN, I reckon you'd be better with TCAS/TAWS until ADSB is mandated.
If you are presently always in RADAR, IMHO ADSB will provide no benefit.