The writers at TechDigest had two dreams since they were wee lads, to see England win the World Cup again and to wear a watch that can display the incoming number for calls. They're halfway there.
In their review, TD says the pairing of watch to phone came extremely smoothly, but then dropped out after 15 minutes. Not sure if this is due to the pre-production sample or just the fact that some phones' Bluetooth stacks die after a while—something we're definitely familiar with. In any case, it's fun and it does what it advertises, which is displaying the caller's name.
We'd only recommend this if you're both looking for a watch and hate digging out your phone from your pants to send calls to voicemail.
Review: MobileWear bluetooth watch [TechDigest]