And no one notices.
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I used for several weeks a couple of months ago and except once on the Vex strike on Mars nobody noticed it or if they noticed they didn't take advantage of it. Even during nightfalls when team-mates were using mics and I told them I was using it. This was with me having HotPF equipped as well. I have pretty much switched to Radiant Skin now and I don't remember ever having a team-mate use SoF.