I erred on the side of 5 rather than 4 stars. Or really, I rounded up. I love this set-up. It provide everything you need to start hydroponics. The only problem is that they leak where the bottom straw thing comes up. Knowing that now I glued them before putting them together. Other than that, they are awesome for so many reasons. I do like that you can see how much water is in there. It's good for bigger plants that are difficult to lift up. They also have a hole that allows for water and nutrients to be added without lifting. The pump works great. The little air stones also work great. It's enough for 8 nice size plants. Anyway, if you are a beginner or a pro hydroponic gardener, these are great. I have purchased 2 sets and will likely purchase again. It's a good price for all you get.