These lamps are for decorative purposes. While they do provide some light they are not meant to light up an area to make it safe to traverse. That being said, I appreciate the soft light emitted when I let my dog out at night and it allows me to see him without turning on a bright porch light. He is lost in the darkness however if he goes out more than about 6 feet from the light. Sufficient for a quick potty break. Not expected for a deterrent. 
The lights charged pretty quickly with indirect sunlight. There is a power button and very simple instructions for use. They came fully assembled and there doesn’t appear to be any removable parts. If you can catch them on sale I would say that they are a quality product that adds to the aesthetic of the space. Matches the plastic wicker like outdoor furniture I purchased from Wayfair as well.