the best skimmer on the market is probably the bubble king. i would say that since the aqua-c's website only states "loads of air" or "large amounts of air", they either have never checked to see how much air (unlikely), or they checked and it doesn't come close to the other popular skimmers (likely).
besides a small amount of efficiency that comes from the different designs, skimmers are only as good as their pumps. that's why if you look at decent skimmers, they will tell you how much air the pump is pulling V.S. how much electricity it draws.
check out bubble king, royal exclusiv(bubble king's new line), octopus, MSX, SWC, euro-reef, Vertex IN, Tunze