Great review by the way. I had this and then I sold it. I was not to happy with the noise it made. Not thats it bad but to much noise for me. I dont think that you should have to have alot of back ground noise just to cover this up. I never tryied it on any laymen but I did try it on my little girl and had the T.V. on and the dishwasher on in the back ground and all she can say was ( Whats that humming noise ) I will go with S2 now. That one makes no noise at all.
At a actual gig though. There really is no noise. You should have tried it. Just general people talking is enough. I found no problems, only when your sitting at home will it make noise. Even if they do hear noise, they doesnt really mean they caught you. Your producing smoke, they hear noise? Not sure if those two really correlate. You could just say its your phone or whatever if its a issue. Under a suit jacket coat its pretty quite.