OK, so I chose the ibike.
The first hassle was the ibike shop on the web. They revamped it a bit since but you can't login to the shop without first clicking on a product and pretending to buy it (then the 'log-in' option finally appears). And when you try to log-in the login ID box is unclickable without 14 'tabs' to get you there. I tried 3 different browsers and 2 PCs... they all had the same trouble. Not everytime, just 9 times out of 10. Anyway, the tab-tab-tab until you get to the correct input box works. (Must admit I just logged in fine, so who knows?)
Enough whinging. I bought it online and found that the 'tracking' option didn't work for International US Post. Not to worry, I guess. 10 working days later it turned up fine, but opened by Australian Quarantine Services. Must have looked suss with 'Velocomp' written on the box... hmmm. Go figure.
The box looks like this:
Which is fine, although for around $A600 it's a trifle underwhelming. Still, it's the technology we are buying, isn't it?
And opening it up we find the device itself, which is tiny and very light (which is good, right?):
It's showing average Watts here in this pic but it will also show maximum values.
And then I mounted it on the bike... well 2 bikes, actually. I had bought an extra mount, so I could swap from bike to bike with ease, something I saw as a killer feature of the ibike over almost all its competition.