What are your thoughts?

It looks like it could be a good drive train. It's the first chain-driven electric motor I've seen.

I also have no idea of the conversion of Australian dollars to US dollars, so I can't comment on price
not sure...

I would do some research on trying to run so much torque through the derailer system on a bicycle. I don't know it could take the pull that a 1kw motor would put on it. Thats why all the kits I have seen use a separate sprocket-chain-motor that never connects to the pedals and original chain and gear system of the bike. At the very least you would have to cut all power assist while changing gears, I would think...