As for charging while riding, if you have a "battery pack" for recharging and if it is the size of a cellphone, like the four of mine are, you can put it in your jacket pocket and use the USB supplied cord (with you 20S or 30K), and continue to use it while listing to your music (like I do) or talk, whatever.
The biggest issue for me with both the 20S and the 30K is the Bluetooth interference I get while riding. And I'm sure it's from all the other vehicles around me. Because, when I was up in Oregon for WeSTOC, I never got ANY interference while listening to my music from my GPS. As soon as I got back home and started doing my commutes again, it was there.
So to fix this issue, I am using my Mini-MP3 player, connected by phonejack to the back of the 30K Mount. I can hear it just fine, without that "off station sound I was getting"