Hi, i use my C5 since a long time now, it's great but for the look and front face protection, it's not the best.
It's very great for listen music (Spotify for music, podcasts, radio, reply for phone) and with Euc World sound for security alarms and receive notifications from your gps (Komoot).
For the camera, quality is not enough but it's work.
Battery life is very good for sound but if you use camera, battery died very fast for quality not the best.
You can heard outside sound.