Let me tell you about my Eheim compact 5000. It is noisier than I expected. I've had to sit it on a media foam pad and I am using medical tubing on the output. Now it's deadly silent. The valve on the side of the pump is fully open and pushing about 600 gph @ 5 foot of head (3/4 PVC). I need to ramp it down. I don't question Eheims reliability, as I've used smaller ones on past freshwater tanks. Next time I purchase a return pump, I too am thinking of trying a Sicce Syncra. Hope this helps.
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