I’ll weigh in.
I currently run two XF350’s on a 6’ long tank.
I hate them.
The good: The flow works well. It is powerful and moved a ton of water in a large swath which is aesthetically pretty. They can be mounted high and still give great flow.
The bad:
1. They’re pretty loud. I’m sitting on my couch 20’ away with a space heater blowing in my face and I can hear them wind up. It’s worse after cleaning but…
2. The flow degrades over time. It happens so I don’t typically notice it at first. Expect to clean them every 3-4 weeks RELIGIOUSLY.
3. The controller dies. I started with the stock controller and Wi-Fi unit. It was buggy to say the least. Seemingly always dying before I left for vacation. The company replaced the controller 2x before we both decided it was enough. I purchased a Hydros wave maker which has been better with recent updates but after 2 years, I just lost pump port 1- it stopped supplying power.
4. Taking the pumps apart to clean them is a nightmare. Well…putting them back together is. Every dang time I put them back together, plug them in, I get an error. I have to twist, retake them apart, and put them back together. Run them out of the water, jiggle them, etc for them to stop giving an error. Could take me 2 minutes, could take me 2 hours. A full cleaning requires pulling the dang cord out which is a nightmare in itself.
5. The shafts strip. I just keep 3-4 magnet drives laying around for when they inevitably strip. They aren’t sealed well and so I tiny piece of sand will destroy them. I go through about $150-$300 in repair parts a year.
6. They don’t stay in place. The magnet is actually pretty impressive and held well on 1/2” glass…Until a snail comes along and tips one side down. Once again, from 20’ away I’m looking at a lopsided Gyre in my tank.
Prior I ran MP40’s.
1 on either end couldn’t push to the center on 6’. Definite con. I would have needed 4. I sold the 2 I had and discussed with my wife the idea of 2MP60’s but I had to go with the new thing. I regret it.
MP40’s- They’re not as loud but you can still hear them for sure at 70%+. Little tidbit: Powerheads like this and lights aren’t really meant to be run at 100%. You should aim for closer to 50-60% to maximize life and limit noise. Another reason I should’ve gone with MP60’s.
My MP40’s with no foam nem guard needed cleaning about every 6 months- not because they were dirty, just because it felt like the right thing to do. Cleaning was easy as you didn’t have to contend with wires. They stayed in place better too.
I’m currently holding out for something better than XF350’s to hit the market (hopefully before the next major repair is necessary) or I will be purchasing 2, MP60’s if the alternative decision is throw more money at XF350’s. They may be noisy but at least they’re reliable.