I bought an Aqua Sphere Seal Kids for my son tonight (expensive for kid's masks at $20). Tomorrow it'll be returned. The Seal does not seal very well across the bridge of his nose. THe straps have to be painfully tight to eliminate any visible gaps.

I do like the design and am considering the purchase of the adult version for myself. Perhaps it's because my Son's got a flatter bridge or he's too young (5yrs old).