I used one for about 4 months.. They are hard to keep in adjustment. If your tank is 50 gallons or under .. I would recommend a Prizm. you can by them for 69.00 at bigalsonline.com for that price and they work great
I had a SeaClone skimmer and while it did work to some degree, it did not work very well. I even tried some of the fixes that were posted on this and other boards but it still did not work to my liking. Last year I replaced it with a Prizm. I think it works just fine for the money.
I have a SeaClone and I hate it. It's very noisy and it doesn't skim very well. My upgrade (Aqua C Remora) is on order. Save yourself the hassle and the money and get a good one up front.