Ya, I got serious pump envy where wife's 75g is going to have the miss-shipped Varios4 in it. It's at least twice as quiet as the Simplicity 2100 running in the tank sitting behind me. The Simplicity has a nice purrr / whirrr to it, but it's no where near the Varios level. Refugium in the 90g is keeping up with the tanks needs so I haven't been running the skimmer at all. That's making the return pump purrr more noticable. LoL. It's all varying levels of quiet.