I saw a Suna traffic review: nothing useful, usually wrong traffic info. Anyhow, I bought a Navman S90i with Suna TMC.
Been using Suna for about three months in my limo. After 3 months I gave up at it is pretty much useless. Clear roads are reported as congested, and it has missed some major traffic congestions.
I can't get any reliable traffic information in Sydney and Canberra. Suna was not reporting in advance advertised road closures (as published by RTA).
In my opinion, SUNA service is just a a waste of money and time.