I just installed mine, green one on each wheel, last week and they are great! I run them solid. I have noticed that autos waiting to pull out in front of me seem to see me from further away and I've had less pull-outs so far. Although you can be sure I don't count on that and still assume they will do so anyway. I haven't seen any other bikes on my route with them and other cyclists have done rubber necks to me too.
Note: be sure to deactivate the "test" mode, otherwise they will not function properly. I've had no problems so far...just waiting to see how they last through very wet weather at this point.