The bluetooth, as expected from a company that makes bluetooth headsets, is perfect. It'll keep two devices connected which means you and your partner can both have your phones connected and trade off playing music. It connects immediately to both Android and iOS with a satisfying "ding" every time you get within range.It sounds great at medium and high levels. It keeps up with my main stereo surprisingly well in terms of sound quality, only really falling on low lows, where it can't keep up with a dedicated sub. However, at low levels in a quite room (a bedroom at night, an empty office with the Jambox on your desk) there is an audible hiss. Jawbone says that a hiss is normal, but you shouldn't be able to hear it once the music starts. However, that's not what I've experience and there are many posts in their forums saying the same thing.I was pretty disappointed at first in the hissing at low levels, but it works so well in every other regard I've looked past it.