I'd heard some negative reviews/rants about overflows so after doing some searching I found out about Lifereef (they call theirs a Prefilter Box). Its rated for 600gph.
It costs ~$120US, and when I got mine hooked up (45gal+29gal sump, mag9.5) it took about 5mins to get the flow rate balanced and its almost silent. There is no airline or any of that sort of thing, except the first time you set it up to get rid of the original air bubble.
I've had it running for about 6mo's now & I have no problems with it breaking suction when its running, when I do a water change or when I have a power outage.
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