My partner and I bought them in a DIY store. At first we bought one pack of four to try them, placing them one side of the driveway. After being pleased with how they worked, we now have 8 each side, 16 in total.
Even in Winter, light shines through the clouds (Thats what its even recommended to wear SPF in Winter). Even on the most gloomy days, the solar lights begin glowing as the darkness begins to fall.
My partner leaves the house at 7am, and they are still glowing at that stage.
They definatly guide people up to my house. My neighbours also have them around their garden flowers and they're great there too (They actually have multicoloured ones)
I think its a cheaper version of the electric lights, and well worth a try.