The Lifereef is a u-tube style overflow that doesn't require a separate pump to maintain a siphon unlike the CPR. It's a malfunctioning pump that cause most CPR failures.
There are other u-tube overflows out there like Hurricane, but the materials and workmanship of the Lifereef put it a cut above the rest. The Lifereef is also big enough to accomodate a Stockman-style silencer whereas the cheaper versions are too small and possible too flimsy to do so.
I used one for several years before getting a drilled tank and it never once failed.
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