After two years of use, the lighting performance dropped by half due to a cheap battery. More as a hobby and experiment, I opened it up and replaced the battery (available at electronics stores) that connects with an electric soldering iron. The brightness returned. Where I charge it satisfactorily (requires at least 6 hours of sunlight). From the beginning, its waterproofness did not seem IP65 to me. I applied black silicone to the joints and black adhesive tape, which held up in heavy rain. Now it's okay, but of course, it's not worth the extra cost and hassle. Prefer something more expensive.
Update (25/8/22): Two months after replacing the battery, something burned out and it stopped working. It went for recycling.

Average due to its low cost. It needs a lot of sun, probably only sun. In the shade at midnight, there will be no battery left at all. Pay more to be compensated in terms of quality ;-)

After 1 year of operation, I come back and reevaluate them because I probably unfairly judged them initially. They still work! So, it's value for money, after all, you get what you pay for.