I actually quite like the idea of these as supplementary lights, as they take regular batteries, whilst still being compact - Not some annoying watch-cell battery you have to order off the internet. Also, they give the added appearance of width during the night without taking up the tops of your bars, or having some sort of extension fitted to your bike for the lights to attach to.
The fact you can use them as indicators is pretty neat, although this probably wouldn't be very effective. By no means would these replace powerful dedicated front/rear lights though.