I run only 1 in my tank and it's great, however the cost to get another MP40 to gain the extra features is a little disappointing. Need to shell out another $500 to get another.
I run both the QD and the ES version on my tank and the QD is noticeably much more quiet, but it is not unbearable. This pump is so versatile it will probably be the last type of pump I buy, but certainly not the last Vortech.
Very loud. I had 2 installed on a peninsula in my living room. very intrusive both visually and audibly. for less $$$ I would go with Maxspect Gyre.
on January 15, 2017
Great product but compared to QD version of the same powerhead this gets only 4 stars due to noise. QD is silent.