Count the number of kitchen appliances you can plug in that you own. Count the number you've used in the last 6 months. If the number you've used is less than half of the number you own, don't buy a juicer. It'll be great for a few weeks at most, then you'll realize that unless you're juicing more than a quart a day, it's too much a pain to clean for the alleged benefit. I believe that the people who use them successfully juice stuff 2-3 times a week, and juice enough that it lasts them for the days they don't juice.
I've wanted a juicer for years, but every time I look at how much fruit I actually eat, and whether juicing would change that, I can't convince myself that I would actually use it more than a few times when I bought it, then a few times a year thereafter - it would mainly serve to take up space in my kitchen.