It was on brekkie tv this morning.
It looks daft. You raise an arm to signal, and a panel on the sleeve flashes orange. So what about when you raise your arm to wipe snot from your nose?
When you apply the brakes, a large panel on the back lights up red; the rest of the time it's green.
Damn - if motons don't seen you when you're decked in fluorescent and reflective gear, they probably won't see you in this get up either.
Edit: Oh, and a presenter said "Lot's of cyclists are killed every year" without any kind of qualification, which immediately told me where to file the info in that feature.