I use them, no complaints whatsoever.
They’re simple & just work, fill the res, check & adjust PH & rock on. No run off, no waste. No hassle. Water's each plant individually so no messing about with pumps or timers as it’s gravity fed.
Compared to a top water coco system means you’ll use around 30% less water & nutrients with no run off so it’ll pay for itself eventually.
The link in signature is to my current thread & another in the first post, to my previous thread (pretty sure that’s when I started using them).
Peace,
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