I use it as a speaker and micro teleconferencing in office. Previously, most of us had a Jabra for teleconferences, but many now have switched to the CSL. The quality of the Jabra is better in my opinion but for my needs sufficient for calls. For the CSL speaks in any case the price. The other participants can be very well understood and vice versa as well.
+ Battery life
+ Bass
+ Sound
+ Optics
+ Microphone
+ MicroSD / SDHC slot
+/- Bit hard, but he really is sound-wise what ago for size
- The blue light when using I do not need