Originally Posted by
TinCow
Scouting. You can spot enemies without them seeing you, and plan accordingly. Combined with Squadsight snipers and rockets, you can kill entire packs of enemies before they even see one of your soldiers. In addition, it makes it much, much easier to obtain Meld. There's significantly less risk with splitting off a soldier to run across the map and snag some Meld when that soldier can stay invisible (and thus out of harms way) the entire way. It's also superb for getting personnel close enough to the enemy for flanking attacks and stunning. Finally, Exalt covert ops missions are a piece of cake if your operative have Mimetic skin. He can run around the place activating all the various comms towers without much concern for his own safety, despite his lack of equipment.
Something that even Mimetic skin users may not have realized: Mimetic skin works in any cover that acts like high cover, not just any cover that is high cover. As such, a sniper with Low Profile and Mimetic skin will actually go invisible hiding in any cover on the entire map. This opens up some interesting options for aggressive Snapshot snipers.