I bought a pair last year. I got them after a trip to the snow when I realised that my old boots just weren't up to the conditions so I bought some shearling lined bean boots, on sale just to see if they would be a good replacement. They are very, very, very warm, probably too warm to be honest. LL Bean offer models with thinsulate and I probably should have gone with a pair of them instead but if you aren't living in a really cold location or head to the snow often then I reckon you'd be best off with a normal pair. Also the pair I got are just a little big, which is good if I need to wear thick socks, however if I was to get another pair then I would size down probably half a size.....maybe even a full size.
In saying that I'm not sure they're suited to Aussie conditions. They certainly keep the rain and water out but they might be too hot for extended wear. The also look a little weird when wearing them, though that could be because they're a bit chunky and I've never seen anyone else wearing a pair so I'm not used to the look of them....even on myself!
I do like the look of the bison leather ones with the red sole. The shoes just look odd.