I got an MP40wQD to replace an MP10 I was using on the left side of my tank. So far, it's a world of difference flow and noise-wise compared to the MP40wES on the right side. I can barely hear the QD even at 70% while the ES has a very audible whine at that level.
It was so big of a difference that I got a QD driver for the ES. It makes the ES just a little bit louder than the QD, which means it's still ultra-quiet. Worth the price if you have an ES and are looking to upgrade for sure.
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