The Solar e-clips lights look really great--for about three weeks--then they become very dim. The batteries just don't get enough energy from the way-too-small solar panel (and this is in Texas where there aren't that many cloudy days). It helps to turn the lights off in the daytime because although they are supposed to turn off by themselves based on the ambient light level, they still seem to use more electricity than if they are turned off with the switch. Turned off during the day, they almost last a whole night.The "rock" really needs to be able to be plugged in, or else have a solar panel about four times the current size, or have two "rocks" which can be swapped out every week or so.Installation is very easy providing you have installed your lawn edging the right way up.