I just had my 20S replaced under warranty. I'd had it about 10 months and during that time I had a number of lock ups, microphones dying and just general unhappiness with the performance of the thing. It seems my intermittent issues are solved with the replacement BUT I still can't be doing it right. I use a Kabuto Aeroblade III helmet, which I understand is ok as far as wind noise goes. But anything over 80 kph and I cannot hear the damn Sena for all the tea in China! Whether it's music, or intercom with another rider it's bloody useless on the highway. I do use ear plugs (the industrial orange foam types) and I understand that may account for a lot of my problems, but I've tried without them and the wind noise just blows the sound away anyway. Is it just me? I see people raving about these things and I'm not happy. At 60 kph it's a breeze....literally. But anything over 80 and I can forget it.