My husband and I have been attending this centre now for 3 years and are very happy with the service. You will miss out if you want a particular doctor and they have already worked the maximum load. However, if it's urgent you can see another doctor. If it's not urgent, why not ring ahead of a visit and ask if it's likely that your chosen doctor would be able to see you? In many other Doctors' surgeries you can't get an appointment for days. Here, if your prepared to wait, you can get to see a doctor much quicker.
Yes, it's true that they do not phone results. It's the same for everyone and can cause extra trips if the results have not arrived, as has happened to us. As their policy is that only the doctor gives you the results, and only in person, at least you can be quite confident that you got the right results and they are kept confidential.
For a clinic that only charges the Medicare fee, I'm surprised how well run it is and how friendly I have found the staff at such a busy and not exclusive centre.