cacklercrazy, We have the Leupold ARD ( anti reflective device), which is a honey combed device, typically shorter than the typical shade. These devices have their plusses and minuses.
Pluses.....work good if attempting to use the scope while looking in to the sun, and offer protection to your objective lense.
Negatives....in twilight, they reduce the amount of light entering the scope. They also add some length to the scope, making some scope covers impractical to use.
We carry ours in our day/fanny packs, and use the as needed. If we know that our game will be in a location where we will be looking into a setting or rising sun.....we put them on. For daytime use, they can stay on as they are not a hinderence and do offer scope protection. In dusk situations, they are removed.
Honestly....we don’t use them often, as they’re a bit of a pain potentially putting on taking off. But, when you really need one.....you’ll be glad it’s there! memtb