I have one of them (xf 250) on my 120, to begin, it seems far too powerful for my tank if even above 40%, sand starts blowing around, corals are about to blow away and everything (Caribsea medium sand)
I put mine vertical on one side, it seemed to be the only way to circulate the water where it doesn't get forced into sand and blow it around.
It seems like there many cool programs but they far too hard to use and program..... it is bizarre to me because there appears to be a memory card slot on the unit and supposedly wifi and an app or something? No word on the app yet. No idea what the memory card slot is for. I would love and easier way to program them with a nice computer graph interface or something. Also no way for timed feed modes?