I belong to a vegetable box scheme, and mainly bought a juicer so I could use up leftovers and also find a use for vegetables which are difficult to eat in great quantities. I can really recommend it, you get whatever vegetables are in season and it's much cheaper than buying them at the supermarket or green grocer's.
It's also fun to receive a variety of things you may not be familiar with or have thought to buy yourself. On the other hand, if you prefer to plan your meals it may be a bit annoying not knowing for more than a week in advance what you're going to receive.
Now that it's summer I'm juicing less, because the vegetables I receive are lighter and easier to eat - not so many beets as I got during the winter when I bought the juicer. I want to start doing it again, because of the inspiring documentary. I tend not to follow recipes, just combine bitter vegetables with sweet fruit, leafy and stringy vegetables with juicy vegetables, bland vegetables with lemon or ginger, etc.