I loved my Tunze powerheads. Very quite, easily controllable, battery backed up, and very powerful. Along with great support. Had all the latest upgrades on them with wide and narrow flow options etc. Only one problem, me. I suck really really bad at powerhead placement and then hated adding a coral and having to adjust powerheads again which made it even worse as I'm down right terrible at this. I have no clue at all at getting it done. Ok, I think I got the point across that no matter what powerhead you give me I will kill a coral. Except for I finally found an answer to my powerhead inadequacies. I got a maxspect gyre and fell in love. My tank has never been happier. I got the icecap modules which allow both the xf150 and 250 to be programmed by the Apex and have one working in sync with the lunar cylce from the Seasonal table. Its awesome. I ended up getting another gyre and another. I do not have to worry about trying to figure out angles and direct or direct vs indirect flow or everything else I was terrible at with power head placement. The flow is now amazing everywhere in the tank. One horizontal on my right pane running at 100% 100% of the time. One on the back left corner of the tank mounted vertical. It alternates forward and backward ramping up to 100% the majority of the time. The Apex seasonal chart is used for programming the direction and when to ramp up and down. In time with the lunar chart and basically alternates a strong undertow from going across the back of the tank to the front of the tank. Recently I also added a 3rd gyre on the upper left back side of the tank horizontal continuously pulsing up to 60% towards the front glass. I was curious and I have a billion spare parts I tried it out and like it. Adds just a touch of turbulence over there. On the otherside with the right horizontal mount I have my return coming in working with that gyre. About 600gph from it now. I would say I have a decent amount of flow and not once did I have to fiddle around with where the heck to point the flow and haven't ripped the flesh off a coral. My fish seem to love the flow and how it alternates 4 times a day. I can see them changing around the currents. Which just them swimming around creates a good amount of turbulence. No sweeping or syncing or anything else to try and create turbulence. But these are perfect for me because of me and my lack of power head placement skills. They are battery backed up and Coralvue has been great to me anytime I've ever needed support. Here's a video before I added the third gyre. And as you can't hear in the video they are very quite for me. You can hear laundry up on another floor but not the pumps at 100% right next to me.