I have been looking at them, I am building a 30 gal sump right now for my 90 and considering this skimmer or a tunze 9010, they say the tunze is good but I just cant see it keeping up with this skimmer when you run a 900 gph pump on it compared to the small pump on the tunze. I am making the skimmer section real small so I can make a large fuge in the middle, I am using black acrylic for the traps, man is that stuff more expensive than I thought. I saw on the sump buddy all you really have to do is change the balls out once a year and they suggest tying fishing line to them for easy removal. I am stuck on wether I want to get it or not because the way I am building the sump I would have trouble getting it out but apparently you dont need to take it out because the pump is not attached to it and the balls you can remove as stated above, heck they have sumps they build with them permenantly built in so I will probably go with it