The Scwalbes are excellent - I had suspected they would be. They are replacing the original tyres that Petunia had when she was new 25 years ago. Realistically any tyre would be an improvement one would think, but the Marathons are great. Very quiet, very grippy. Sydney Olympic Park is mainly paved bike tracks but there are some clay/gravel tracks there too which we tried out. I felt more confident riding on the dirt tracks with the new tyres :-). They feel much more stable. They are currently inflated to 80 psi but as they can take more I'll put them up to 85 for my next ride and see how that feels.
As usual I had the camera but was so busy riding I didn't think to stop for pics. D'Oh!