I'm not sure why people have so many problems save for bad impellers which were an issue (and may still be). I know Vertex is working on a completely revised impeller and I suspect anyone with problems will get that once it's done. The pump motor blocks themselves are pretty much bullet proof.
Otherwise, all I can say is mine is working just fine pulling out dark green/brown stinky dry skimmate all day long. They do better in 7 or so inches of water than 9 or 10 and in a chamber with a stable water level. The only time it stops skimming is if I've put something in the tank and oils from my hand maybe affect it etc. But it always goes back to normal.
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