I did finish the recirculating skimmer; Felipe used it on one of the systems at Fin-addict until someone bought it. It worked well, I'll tweak the design for the next one. The issue with those skimmers is that the venturi that comes with the sedra pump is not so great. I'm thinking about using a beckett in conjunction with a needlewheel pump on the next one. It's really hard to beat a well designed beckett skimmer for overall performance IMO. The needlewheel skimmers are popular because they're cheap and easy to manufacture and because they don't use a lot of power. Beckett skimmers, to work well, need a stable pressure pump, and that's not cheap. With the right pump, though, they really do the job.