We did a lot of pushups in our sniper school for not closing our lens covers or engaging the safety when we weren't behind the rifle. We used ARDs during field exercises along with mesh netting and women's hose but our engagements were two legged. I personally use the sunshade that comes with the scope for hunting and since I typically take one shot, mirage has never been an issue. I use a suppressor cover to deaden the "tink" sound created by my titanium suppressor. We never talked about an ARD being helpful for mirage so I can't comment on that. When it comes to concealment, there is nothing in nature that is perfectly round, so I painted my ARD to break it up. They do affect how much light enters the objective lens to a degree which is why I don't use them for hunting. They are helpful in controlling flare from the sun, even a long sunshade can allow flares, if reflections and flares are the concern, an ARD is useful, just get one long enough to eliminate flare. This is way longer than I intended, sorry.