No fifth star because they are a bit flimsy, although once in place in the garden, this should not matter. They provide a nice amount of light and last most of the night. Remains to be seen how long they last and whether the flimsiness has any effect on this.
4 stars because I have only had them a short time and older solar lights tended to give up the ghost fairly quickly. I got these for a flight of garden steps and they work very well and look quite smart. Will get some more now. I will come back in a year and add the fifth star, if they are still working then.