Our history (and landfills) are piled high with devices that never quite delivered. Remember Microsoft’s Zune, which hopelessly tried to take on the iPod? Or the two-wheeled Segway, a failure to the tune of 30 000 sales in seven years? Yep, for every genius gadget there’s a bunch of duds, which is why we’ve set our BS monitors on high and put the next-gen tech of the moment to the test.