Had the same problem as EOD Steve; the tinting plus the killflash made it impossible to see out of the EOTech. Of course, people will say that you shouldn't be looking out through the optic in the first place (use both eyes to overlay the reticle onto your target), but if you plan on using a magnifier combo, it won't work because it's too dim. Take gogojuice's advice; buy some lexan and make your own lens protector. Easy and cheap.
Now if you use a red dot or a scope, a quality killflash is amazing.
Primary: Custom VFC M4 - KJW KC02
Secondary: Custom TM PX4 - KJW Mk1 - KJW M9
Camo: Pencott Greenzone - Pencott Badlands - MARPAT