I am sorry but I would liked responces that were based on knowlege of the type of product I asked about from purchase or use of the indicaters.
It seems you just dont like the idea of them full stop, ok but that does not help me or answer my question.
Ok long considered and non p***takey answer.
I've never used them but have looked closely and considered the merits of indicators in the past. I've also googled the 2 you mention to have a look, but if I'm honest, buying a pair so I'm justified to comment in your eyes is a step too far :-)
Think how close they will be together on the bike and how unlikely it is that drivers will be able to genuinely differentiate between some more odd little blinky light in the middle of the bike compared to directional indicators on a car, remember indicators are ingrained into the psyche as part of a car and they live on the corners some 6+ feet apart so it is a no brainer what it means and which direction the flashy light is talking about on a big tin box, not so on a bike.
Also there's any number of permutations of white, blue, yellow, red, green etc lights that adorn bikes and orange pedal relectors on some. As has already been stated, they're an exceedingly unusual addition to a bike, drivers won't expect a cycle to indicate with lights and in all likliehood, 99.99% won't have a clue that is the intention of them, thus making them gimmicky, counter intuitive and far more likely to get you knocked about on the road than a £3 yellow reflective slap band around the wrist to highlight an outstretched arm and/or gloves with some sort of indicator/arrow decoration on the backs.
Another consideration is how much clutter you want on your frame and bars,
Lastly, whilst we all love a good fettle and the opportunity to play with our toys in the kitchen of an evening, it does seem to be adding something that could well go wrong (particularly in the wet) and is in such a position on the bike that you may well not know about it until you're having a slanging match with a driver because you think you've indicated but in reality nothing has happened and s/he gone up your a**e.
if you really are determined to have a punt, the Winkku, mirror/indicator combo may be the best bet, they're as far apart as it's possible to get on a bike and in your line of sight and by the sound of this youtube - you'd hear the things too
View: http://www.youtube.com/watch?v=TWsAwaLw32E
I have no vanity over the Miss Marple look of my bikes, ride moustachio'd bars and would not think of riding without a mirror but even I'd baulk at these TBH not just because I wouldn't give indicators the time of day but frankly they are pig ugly.