Quick shipping & product does work well & keeps the umbrella in place but the pins to hold each cube in place could be longer So they would stay in place better
Does the job of holding thee umbrella in place ... however filling with sand is awkward. (filling with water was. a no-go with our cold nights.) A bit pricey for what is basically four plastic bottles, OTOH, they look much better than a bunch of sandbags laid over the umbrella stand.
Metal pieces meant to hold the sections together are too short & don't reach the drill holes - hopefully it's not a problem since the weight of the water should keep them in place.
Plastic is thick, I used water instead of sand. Holding our cantilever umbrella with no issues. Only thing I’d improve is the metal brackets holding each section together. I’d extend the ends to provide a more secure fitting.