I purchased three of these my first season. The following year I added three more. I don't know enough people to give all the extra tomatoes to, so I stopped at six. There are several ways to create your own DIY version of this system, but I thought they were reasonably priced and all I do is add potting soil and my tomato plants. I used cages for my indeterminate plants, but just a wooden stake for determinate varieties. There is nothing better than stepping out to your container garden, plucking a couple of fresh tomatoes for BLT's. I can a lot for making chili and soups in the off season. This is a link to a video that demonstrates it nicely. There are a lot more videos once you get to this link.
GroBucket Tutorial - Not A Fishing Video - YouTube