What is the downside of leaffilter?

Disadvantages of the LeafFilter GutterGuard Large amounts of rain will not be able to seep through the mesh and continue through the gutters, but will run down the sides of the house and to the base, eliminating the whole purpose of a gutter system, let alone a gutter protection system. LeafFilter is an immensely popular mosquito net in Westborough, MA, but is it really the best? Or does Gutter Shell beat him, as he beat LeafGuard in round 1 of gutter cover comparison?.