Euro Reef works, no tweeking, dialing in, headaches, mistakes, or anything of the like. With the gate valve, it allows you to adjust the skimming from wet to dry and everything in between, with simplicity. There may be some mods that can make them even more efficient than factory, but still out perform most, IMO..... I consider my cs6-3 rc, a return on investment. I got mine for 275.00 on this forum, less than a month ago. So, not too bad for a skimmer that I can certainly make 1-2 upgrades with, and not have to re-invest. If you want a skimmer that will skim, IME, I say gooooooooo Euro-Reef.....................