good design. if you are wearing your headphones everywhere and just want to move them to your neck when not listening, this is the one headphone to get.
Pro
no fuss comfort
no need to take out of ear if you want to speak to someone
one-piece-design: no need to manage individual buds and cases
Decent sound quality
No danger of damaging your eardrums
watertight in rain and such
never ran out of battery
Contra
special charging cable
needs care not to overland or crack the rigid wire