Hourglass Cold Brew Coffee System [$60; hourglasscoffee.com]
To use this space-age, shatter-proof, and BPA-free plastic gizmo, you combine grounds and water in one chamber, let them sit for 12 to 48 hours depending on strength desired, then flip the whole machine to filter.
The Good: Makes the strongest concentrate and allows grounds to be used twice.
The Bad: It’ll make your counter-top look geeky.
Best For: Gadget hounds and bold-brew drinkers.
Score: 8 out of 10