The portable Bluetooth speaker is fast becoming a standard accessory in our increasingly tablet and smartphone-centric world. But with so many options out there, how do you know which one is actually the good buy? Having used several, when I saw Braven's line unveiled earlier this year, I was intrigued. Not only did they look good, Braven promised high functionality to go with that sleek form factor. What did make me a little suspicious is the fact that Braven isn't actually a new name in the business - they previously marketed their speakers as the Spar Zephyr line, and have undergone a makeover for their next generation of hardware (which looks exactly like the previous generation).