I'm very happy with the Nutribullet blender. It's powerful, blends quickly, and is ideal for smoothies. It's truly a perfect appliance for one person.
It's important to note, however, that this model is actually intended for one person. For a couple or a family, it's probably too small, and you're better off choosing a larger model. That's both a plus and a minus: it's compact and easy to use, but the capacity is limited.
That's not a big deal for me, but I hadn't realized beforehand that it's strictly a one-person model.
All in all: a great blender, as long as you know what you're buying.