Ninja's Twisti SS151 high-speed blender has a built-in twisting tamper that produces super smooth smoothies every time. I test-drove Ninja's mighty blender for a month, churning out shakes ...

And blenders are some of the kitchen products I've tested the very most. Though I've given most of the ones I've tested away, there is one I've kept for myself: the Ninja TWISTi High-Speed Blender.