The JE98XL is pretty big. I got one for my wife for Christmas and when it's clean and sitting on the counter it takes up a decent amount of space. After juicing, when she cleans it, our entire dish rack is filled or overflowing.
And yes, if you have a small fridge and plan to juice a lot, you'll also be going to the store a lot. Things like carrots and celery store pretty compact and large bags of kale can squish down pretty good.