I prefer the qwest to the raid 2. I think the quietness claim is based on the stock raid. I had the whisper kit which improved it a lot, but annoyed me that I had to spend extra when I bought it. The Qwest has the equivalent built in and the volume for me seem about the same as a raid 2 with whisper strip, chin curtain and breath deflector
Nothing is foolproof to a sufficiently talented fool.