Here's what I wrote a couple months ago about my experience with the 20S.
And an update - Normally I don't get on the freeway much so most of my phone calls are city speed, but recently I had my first phone call on the freeway at speed (~75mph) and the person on the other end couldn't even tell I was riding. They didn't hear any wind noise and crystal clear audio on their end as well as mine. Their only indication that something was different was my voice undulating when going over bumps.