Positives: The sound of the headphones is good. Surprisingly deep bass, even at max. Volume without distortion. Negatives: 1. Device: iPhone 6: massive disconnections even at 30 cm distance. Hold in your hand was just about ok, in your pocket sticking - not available 2.Gerät: Ipad Air: Something better connection, but still massive disconnections. 3. Device: Samsung Galay Tab 4.0 -As the iPad Air Maybe it's a "Monday" device ?!