Having purchased some large planters for our patio we realized that we needed a way to move them around when it came time to power wash or just change the arrangement.  Since these caddies will hold up to 500 pounds we decided to try this product out because a few of the pots are terra cotta and weigh a lot.  Previously, we had bought a different kind that had a plastic water catcher and another kind that was supposed to offer 200 pounds of weight.  They both failed.  For one thing the wheels on them were a poor quality and not strong enough. 
We are so pleased with these caddies because of the quality and strength and the movability.  We ended up purchasing two orders of them.  Also, they come in black and terra cotta colors which gave us the option to coordinate the color of the planters with the caddie. 
This is a great product!
Thank you.