I went to the caravan and camping show at Rose Hill today. The Eco-Billy was there in both the 750 ml and 1.5 litre (?) sizes. I had a good look and compared them to the Dingo Bush Kettle beside them.
The Eco-Billy is quite rough in construction albeit sturdy. The Dingo is much better made also I'm a bit wary of the pop riveted on handle.
I prefer the Dingo's spout - the Eco has only a hole. The Eco may be easier to fill as the lid can be removed completely whilst the Dingo has a smaller hole in the spout.
The Dingo is spun aluminium so it is very light.
I think a possible failing of both is that neither have a separate fire base like the Kelly. I'd expect that lifting the kettle off the fire would result in the fire collapsing. Maybe, in practice, it doesn't.
Any comment Bushie?
In the end, I bought the Dingo for $99 - the same price as the Eco. See
http://www.bushkettle.com.au/
I hope I use it. i can see myself getting flak from my wife over this purchase.