No doubt that the Euroreefs a very good. I was going to get one but I let Jeff at Lifereef talk me into getting one of his. It is shipping on Tuesday
. One feature of the Lifereef skimmers is that they can work in the sump or external. Same model works either way, it's just a matter of plumbing for external use.
From what I've read on this board, you couldn't go wrong with either one of these fine skimmers. Everyone on this boards speaks very highly of them both.
The Euro-Reefs are simple plug-n-play skimmers that work very well - however IMO I personally believe you'll get better performance from an AquaC EV-240 or Beckett Skimmer.