I have the lights for over 2 weeks now, so feel I am ready to review them.
I have mine wrapped around the top of my balcony, luckily there was exactly, to the cm, enough to do this as dictated by the regular intervals of the railings, but that is by-the-by, the lights come on after a days charge at dusk, or if a pigeon sits on the solar panel... You can have it come on as either constant light or as flashing, note it is a flashing rather than a flickering.
Two days after I have set it up, we had some torrential rain fall causing flash floods around the area, and when I got home I was a little concerned to see that the lights were not on, I assumed that the rain had got in to the casing and shorted out the battery, however with a few seconds of shining the light from my torch on to the Panel, the lights then flickered in to life, albeit for a second, so realised that unlike some solar powered items this one needs a relatively bright day, and finds it difficult to convert power on days when its very overcast (Dark clouds only not white clouds).
I have Solar Panel facing south and on an average UK day (little sun, little rain, a little overcast) it gets enough power to charge the lights until sunrise (on flashing mode in the winter months).
Overall I am impressed and I am considering getting the white ones to mix amongst the blue ones.
So over a year on and they are still going strong, and a number of my neighbours have bought similar ones since mine, but they don't seem to keep their charge for as long as mine, I did get the white ones and am still very happy with both.
Still going strong, the cabling has faded and I would not want to have to relocate it as I am not sure the cable would survive, however it has been out to face the elements every day for the past 2 years so I am still impressed with these lights, as are my neighbours who bought these on my recommendation.