Have iFi raised the performance ceiling for portable Bluetooth DAC/Amps with the iDSD Valkyrie, or does the hefty "dongle" fall flat on its promises?

The best tech products announced this week include Bang & Olufsen's portable speaker and Leica's special-edition camera.

Bowers & Wilkins brings studio grade audio to the premium mid-range with its all new Px7 S3 over-ear Bluetooth wireless ...