I agree that they may not be the best choice for all systems. I answered only how they perform, not if you should use them.
I prefer open media filters or filter bags over fluidized bed or sealed canisters for ease of replacing. The heater modules are safer than submersing a glass heater, but titanium heaters are very durable and can be mounted on a piece of styrofoam (at the top) so they float and keep the wire out of the water.
I like using a mechanical filter (pleated cartridge) but they are only effective if you clean them at least once a week.
Modules are best suited for a closed system without a sump, where everything is run on pressure in-line. Unfortunately, this excludes a refugium and protein skimmer unless they are treated as a separate entity.
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