As of February 2015, both the NutriBullet and Magic Bullet have overwhelmingly positive reviews on Amazon.com. While both are small blenders, the NutriBullet is geared more toward blending beverages, while the Magic Bullet is intended for more general use.
The NutriBullet is described on Amazon.com as being powerful enough to liquefy fruits, vegetables and seeds into smoothies. Many reviewers indicate that they use it for this purpose and are satisfied with the results. Quite a few state that the appliance helps them to incorporate more fruits and vegetables into their diets. Others express frustration with the product's seal and durability.
The Magic Bullet is described as useful for various prep tasks, such as chopping, grinding and blending. Amazon.com reviewers praise its compact size and ability to make smoothies. Some complain about the lifespan of the motor and gears.