CONTRA:
-Klangqualität Is not the best side of this unit. The sound seems to be very compressed, voice playback is unpleasant.
In the same size there are better speakers.
PRO:
-Long battery life
-compact (Each side 45 mm) and light (89gr)
-stable BT connection (MacOS, iOS, Android)
-very quality workmanship
-good volume
PS: What have I done compared. As a reference for the work I have the "Small and Hummel O300". Since we know exactly how the sound looks and should sound :)
Den Anker speakers I compared with the following devices: Mobi Wawemaster, Bose SoundLink II, Bose SoundLink Mini, iPad3 speakers, various iPhone models. Unfortunately, the anchor was in the "sound quality" worse than listed by me equipment.