Let me count the ways:
It cost 1/5 as much as a Vitamix.
It pulverizes everything. Everything.
It doesn't leak.
It's easy to clean. No icky gasket thingy.
It came with a single-serve container, so you can make a reasonably sized smoothie and drink it out of the container.
It also came with a huge-ass container, so you can make smoothies for two, or a huge-ass smoothie for yourself.
It makes pretty drinks like this:
|unsweetened almond milk, banana, frozen blueberries, hemp protein powder|
Instant gratification: bought it at Bed, Bath, and Bite Me with a coupon.
When you put it on the counter it does. not. budge. There's no way for cats to push it off the counter.
Did I mention it cost 1/5 as much as a Vitamix? It's entirely possible, of course, that the Vitamix works 5 times as well as the Ninja. But I really don't need it to.