Unfortuntely , alot of people have "jumped" on the band wagon about pinwheel and or cone skimmers. They are told that these so-called latest designs are much better than downdraft or beckett designs...which ofcourse there are not ! However , cost of such designs have come down at the expense of lousy craftmanship, because they are made in china and on the other side of the equation, german made products are way too expensive for what you get. I've owned top line Deltec and H&S pinwheel skimmers which were capable of skimming tanks from 1500 - 3000 gallons.These skimmers did perform well at an purchase price of an "arm and a leg"...we are talking literally thousands of dollars here !
However, I've compared these to an MTC HSA-3000 dual beckett skimmer and the difference was amazing on how the beckett kept my large reef(packed with fish & corals) cleaner ! The cost of my beckett was WELL below the cost of my pinwheels even with a power hungry pump , it still justified keeping the beckett because of reducing my (cost) sweat equity into keeping my tank clean .