The sound quality is quite good (some bass-heavy), the comfort of the earpiece is good, the attachment to the bracket a bit cumbersome (eg the T-shirt collar), the Paring with eg an iPhone goes smoothly and quickly, the battery life is very neat - So much ok. However, the BT connection interrupts very often what the listening experience significantly tarnish and makes use of the Iqua Spin impossible. Too bad, but because the most important for me functioning of the device, namely the continuous ensure proper music reproduction is not assured, there are only 2 stars - and of course, the headset goes back again.