I used them when I was doing stealth stereo recordings with a pair of lavaliers carefully placed on the sides of my backpack. I admit that these fluffy things will make me look a bit less masculine, and sometimes they made people aware that I was recording, but in the end, they are black and not so obtrusive and they are the only solution when you need to use a lav microphone with heavy wind. They will eat up some high frequencies, but they pair well with lavs which are already boosted in that area.
