I buy mine - I don't use the juicer often enough to justify making a smoothie. The cleaning process would be easier if it were done more often, but it seems extremely tedious to use a blender from time to time.
I like Naked Green Machine
as my number one, Odwalla Superfood
as number two, and Bolthouse Farms Green Goodness
as number three.
You'll see me drinking a lot more Bolthouse than anything else though. It's substantially cheaper!