I have two. Both connected to Dart pumps, each going to 4x1" inputs. 2 of the outlets are delivering water at any given time. I'm very happy with them. If I did it again, I might use LARGER tank bulkheads because when the water fires out of the 1" outlet, it is really moving!
They can be sensitive to fine sand. They jammed on me when I was installing rocks and sand. Paul has a modified piece that can help you if you think you'll have sand issues. Since I've stopped moving rocks and sand around, they've been problem free for about 6 months now.
I like the water flow that I get when I have both OMs sychronized. One must rotate slightly faster than the other because I need to resynch them every 4 months or so.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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