Well, I guess I'm going to have the dissenting opinion here. I've been running one on a closed loop since September. I thought it was great at first, maybe just a little noisier than I'd like. But I've had a microbubble problem pretty much from the start. At first I thought I had a leak in my closed loop, but I rebuilt the closed loop to remove the SCWD. I still have a problem and it's getting worse. I can fix it by shutting the output side ball valve to about half flow. I looked for threads about cavitation, but didn't find any on this board and only a few on some others; however, I feel pretty certain that is my problem.
As far as other pumps, I just installed my chiller this weekend and I used a a PanWorld/Blueline and it is so quiet. I belive these are Iwaki "knockoffs." I'll eventaully be replacing the Gen-x with one of these when I get some extra cash. 
HTH
By the way, if anyone has a solution to my microbubble problem, I'd love to hear it!!!
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Katrina
90 Gal AGA with 2-250W 10k AB DE MH, 220W VHO, Turboflotor 1000, GEO calcium reactor, Pacific Coast chiller, DIY phosphate reactor and nilsen kalk reactor, sps, clams, zoanthids, rose BTA, ocellaris clown, 2 green mandarins, royal gramma, purple tang, sargassum trigger, flame hawkfish, coral beauty, neon dottyback, purple and blue linckia star, brittlestars, snails, snails, snails
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