I have one of those Magic Bullet blenders and it works great for making smoothies and shakes.

I throw in some frozen fruit, yogurt, maybe some juice, a splash of milk and a handful of ice cubes and blend it for about 20 seconds and it's done. I never really measure anything and make it different ways all the time.

I have seen those advertised on TV and they carry them in our local Walmart. I wondered how well they worked. I will have to go ahead and pick one up. They sound very convenient to have.