don't argue that, the versiplug does restrict the flow, but because it doesn't have a flap and doesn't rely on the orientation of the ski to function for fail, it's the lesser of 2 evils. I had a wamilton's scupper before and that would let water flow in constantly when sitting (un powered).
not saying versiplug is the best, just saying it was a safer option than the scuppers. paired with a bilge or 2, it's not a bad system.