I've been through a number of hands-free devices over the years.  I've bought and used 4 different Bluetooth headsets with varying degrees of success; some work, some don't.  I've had some decent headsets, but don't like wearing them and often forget them.  They've also been -- in my experience -- a little problematic to operate; some don't work with all phones, for example, and often you have to repeat pairing on a weekly basis to keep the device working with your phone.  Some have poor battery life.  Some have numerous accessories -- like charging stands and power supplies -- that make them really not that small or self-contained.  Then there's the fit issue, some of the ones that clip over your ear are uncomfortable, some of the ones that use an earbud to fit into your ear are too loose -- you get the picture...