Some are quite good, on the ranch where I live is an old cemetery, a couple of people from the early 1900's.
We cleared the area and mr ranch owner put surrounded it with solar lights, they've worked fine for over two yrs
There are some on the gate, 3 or 4 yrs still working good.
We bought some to put around inside the buildings at night for when there is no wind ( we is off grid ) and the lights don't work.
The new ones crap out real quick.
Buy the better ones, or buy a few different brands and buy more of the ones that don't suck.
For off grid wilderness living they're great.