The purpose is to protect the sight while transporting the weapon and it will probably exceed this expectation. After having it for a short while, I'm not sure I'll use it that much. Will have to see. The Eotech seems pretty robust but the cover would protect the lenses from falling objects, etc.
Pros: Secure attachement, affords protection
Cons: a bit expensive for how it looks
This review was written in the old system and had content requirements that are different than reviews written today.