I wanted a skimmer that is easy to use. I basically wanted plug and play. Its an insump skimmer. The collection cup holds almost a gallon of nog. Its extremely efficient and each pump can be dialed in individually so you can really get the consistency of skimmate that you want. DAS received a license from Deltec to produce their skimmers. Deltec has recently upgraded their needlewheels which are available to buy. Essentially you get a deltec at half the price. Honestly, I did not really notice a difference between the DAS and The Aquabee pumps. They both are eheims. So if you get a DAS skimmer dont even bother with the upgrade The reaction chamber is 8 inches wide and the collection cup is 11 inches wide.