Update: just had the D27F fitted by the guys at HS Auto Elec in Ringwood. They had to make a minor alteration to a bracket but apart from that it was apparently straight forward.
Compared to the D34 many people have used in VEs it's a better option I believe. Similar price but CCA of 830 amps compared to 750 for the D34 (I was thinking 650 in my first post ) and MCA of 1025 amps compared to 870.
Most importantly I believe the terminals are not back to front as on the D34.
All up $329 inc free fitting. The guys at HS were great - very friendly and smiles all round. They also sell them on eBay but I didn't go through eBay.