Post paid here, with some on contract and some off. Business account, received email and bonus point offer.
I am somewhat amused by those who think that Optus, Telstra it Vodaphone can be compared just as a whole entity. Something like mobile broadband has so many variables, that the same carrier will deliver vastly different experiences to different people.
Even after you get over the obvious coverage / geographic differences, the one physical network has a plethora of virtual services, all with different priorities and speeds. Just because Vodaphone or any of the virtual providers is on a particular carriers network doesn't make the likely experience comparable. Different APN will get different priority, speed and response.
Even within the same carrier, pre-paid, post-paid and business plans may be on different virtual networks, with vastly different priorities.