I've used the XF-230 for quite a while now. I will also chime in with my experience on a couple issues that have been talked about. For one, the noise issue. When I was running them on my 120 gallon I was ramping them up from 10% --- 70%. They were not silent, the jebao's I was using before were much quieter, silent I would say. Although, I had them ramping from 30% ---- 100%. Not sure if that made a difference. That being said, I have since gone to a smaller 65 gallon tank and run the XF-230's from 10% --- 50% and the difference is night and day. I would now say they are silent. I think it's due to a couple of things. Break in period is over and lower percentage. As of right now, I am very happy with these pumps.
The second problem I hear about is the cleaning issue. On this issue, I have to agree. It's more of a PITA with these pumps then others I have had. I don't have any problem taking it apart for cleaning, but it just seems the parts are harder to clean then other pump parts. I think it's just the way the pump is engineered. Also, I can confirm that without periodic cleaning the flow will be diminished substantially. At least more than any other pump I've used.
So for now, I will stick with them. When clean and running properly, the flow is like not other and that I like.