6 months in and pumps working great and still nearly completely silent. Did a good cleaning and didnt realize how much the intake had clogged up and getting fantastic water movement again. I recently had to setup the mp10 in a QT tank and had forgotten how annoying and loud that pump whine was.
I think one of the biggest advantages that I noticed was simply from flow coming from 2 different sources and pointed at towards each other. Of course you can do that with a vortech as well, but man that is pricey. Having opposite direction of flow causes significant turbulent flow when the 2 water jets hit each other. You cannot get this same type of flow with 1 pump no matter how fast or strong it is.
The only downside I see compared to the vortechs are the cable in the water, which I got over very quickly, and the width of the flow is narrower than the mp10, but the head is directional which makes up for it.
I am strongly considering another ow-25 for 3 total, and its not because the flow is lacking, but my sps love the increased flow.