Kaz, Have been catching up on all this discussion. I agree that if used properly with good pilots it is great - only concern I sometimes have is that there are good and bad pilots out there. I fly at Camden which is controlled - and people still manage to regularly mess up !! I have copied in the VFR guide mention of UNICOMs for reference - the highlighted part must be the most important.
UNICOM (Universal Communications) is a non-ATS communications service
provided on the CTAF to enhance the value of information normally available
about a noncontrolled aerodrome.
The primary purpose of the frequency used for UNICOM where the frequency
is the CTAF is for pilots to be able to exchange relevant traffic information.
Services available from a UNICOM should be considered as secondary and
must not detract from the interchange of traffic information between pilots.
Persons providing a Unicom service are required to be licensed by the
Australian Communication Authority (ACA). Detailed information regarding the
licensing and use of equipment may be obtained by contacting the ACA in the
appropriate State or Territory capital city
Participation in Unicom services relates to the exchange of messages
concerning:
• fuel requirements;
• estimated times of arrival and departure;
• aerodrome information;
• maintenance and servicing of aircraft including the ordering of parts and
materials urgently required;
• passenger requirements;
• unscheduled landings to be made by aircraft; and
• general weather reports;
• basic information on traffic.
This information is available to all aircraft during the times that Unicom is
operating.
Weather reports, other than simple factual statements about the weather,
may not be provided by Unicom operators unless they are properly authorised
to make weather observations under CAR 120.
The Unicom operator is solely responsible for the accuracy of any information
passed to an aircraft, while the use of information obtained from a Unicom is
at the discretion of the pilot in command.
Unicom operators must comply with the requirement of CAR 83 (2).