I didn't think I would be impressed by this product at all. But I was desperate to try to find something that would work on our steps where we have no electricity and it would be extremely difficult to run wiring. I have come away from this really impressed. It's not perfect, but it's perfect for my situation.
Pros: I didn't wanna have to drill into my railing. So I tried the double-sided tape that comes with the lights. Through multiple rain storms in the northeast, these have held onto my railing without any issue. They also has three different lighting modes, left right or down. Or you can do all three at the same time. I did all three at the same time and you could see in the pictures the amount of life. It's not perfect, but it is better than what I thought it would be.
Tip: wish I had read the instructions before I had tried to install these. I thought they were all broken. Nope, in the small print it says you have to hold the button which is underneath the light for three seconds. I was not holding it long enough.
Cons: these don't light up my whole step the light is brightest immediately underneath the light in a small arch. It provides a teeny bit of light for the rest of the step. However, I went into the sink. It wouldn't provide even a good bit of light for any part of the stuff and I was wrong. Again, it's not perfect, but given my limitations on my steps with electricity, the solar lights are the bomb.