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I have always wondered about these too. I like the box they come in. My LFS (Really hight tech LFS) uses them in their LR curing bins and a couple of smaller show tanks. I have watched them work and they seem to collect quite a bit of skimmate without much fine tuning. Seems to be a pretty good choice for a reasonable amount of money. The only thing is that they do not seem to be made up of the most durable components. The plastic seems to be a little flimsy, but I don't speak from experience just from what I have seen.