I have a couple of MP10s in my 57 gallon reef. They are very nice powerheads. I run them in EcoSMART mode, which generates random and standing waves for 50 minutes each hour, and run in "nutrient export mode" for 10 minutes every hour. It performs extremely well, providing very random and strong flow for coral, and also keeps the tank clean. I have no dead spots, and have never cleaned anything off the sand bed or rock work in the 10 months they have been running in the tank.
They look really cool and provide a large amount of flow in GPH
over similarly sized powerheads. The one draw back: They do make some noise. Being that the motor is on the outside of the tank, they can be hard, especially if you run them at high settings. I run each of mine at only 50% of max, but they can still be heard from time to time... it isn't terribly loud, but it is there, and you can hear it pulsing away from time to time. Very minor annoyance overall, and I am extremely satisfied. I run a couple of hydors for other applications in my other tank and also my mixing tank, and can't imagine having those things in my reef.