Do you mean the MDQ/MDQX series? If so - rock solid. I have seen those pumps take some amazing abuse and keep humming along. Likely not as energy efficient or quiet as new pumps on the market (DC pumps), but solid.
Maybe a tiny bit quieter.. I used little giants for years and have a 4MDSC on my mixing station that I've had for about 20 years. It's still going strong.
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