I'm a little stumped by this response. According to their respective web sites - both shields are made from .187 acrylic material. The only difference is that the Cee Bailey says that it is: "Manufactured from .187 aircraft grade acrylic", while the Clearview says it is made of "Premium High Impact Acrylic Blend Material", and that [the] 3/16″ (.187) Thick Material is More Rigid than the Stock Shield. I'm stumped, unless "aircraft grade" material is more rigid that the same thickness of "acrylic blend" material. Perhaps having the Clearview vent installed compromises the structural rigidity of the Clearview shield.
In any case, both have their proponents here - so my choice is more difficult than ever.