I like mine with conditions:
1) mine leaked pretty bad once algae started growing, if algae grows over the little spray holes it will shoot water down the tube and out of the unit between the pipe and the main body. I fixed that by adding an o-ring to each side of the tube and there hasn't been a leak since. so that's fine i guess, maybe that's a common thing with scrubbers?
2) same thing as one except when the algae grows over the holes sometimes it grows in a way that it will shoot water a little crooked and it will sound like someone is peeing in my sump because the spray is hitting the water directly. I'm going to make some kind of cover for the spray bar to block the light so hopefully it stops growing over the holes. they are a pain to clean out.
3) it's metric plumbing. . . i'm just not a fan, if I want to modify something or if the union starts leaking down the line I can't just go to home depot and replace it.
4) the screen is perfects smooth when you get it. mine wouldn't grow anything so I roughed up the screen and it took off.
that said for the price it's great, just know going in that you'll have to make some modifications but it's much cheaper than the other options (except DIY?)