After years of taking up way too much space or otherwise looking dorky, Bluetooth headphones are finally starting to make sense as an alternative to their wired counterparts. Take the Plantronics BackBeat Go ($100) for example. This tiny set of in-ear phones offers passive noise cancellation, inline controls for skipping tracks and adjusting volume, up to 4.5 hours of playtime per charge, and the ability to function as a Bluetooth headset.