How much pressure could the water be under without some sort of mechanical means? Really if it's under 15 feet of water that would be 1.5 times the pressure. And the water would just find another weak spot in the system.
I'm just thinking back to when we did the bathroom in my basement, and my plumber insisted I install one of these. (My cousin, so he wasn't getting paid for the work.) I just don't see how it could fail catostophically; meaning it would either help a lot, or worst case be the same as if it wasn't there.
Now, I did hear of somebody who pumped out their basement too early and the water pressure on the foundation walls pushed them in. Not sure if that was true or just an urban legend.
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