++ ++ Sound
Sound is also rather moderate at concerts. As bad as in a mobile phone just as well. For leisure activities (eg riding a roller coaster) but totally ok!
++ ++ Accessories
Accessories is ok. A rubber band and 2 devices are sufficient for lending, you have to stop to improvise a little. The water-shell creates the 20 meters (18 feet was on: No problems).
Have the device for sports I purchased leisure, festivals, holidays. Because there they have to withstand a lot. For the 300-400 euros were too bad for a GoPro. I also needed a screen on the back. Always worth gold again! The GoPro App for smartphones (transmission via WLAN) is namely a short delay and cumbersome ... that would have brought me nothing for the rapid and spontaneous film.