I had read about this place on happycow, and stopped in recently. Here's my Moon Juice review, February 2012.
It's a tiny little juice bar with 2 open refrigerator cases filled with various pressed juices (green ones and orange ones). Each bottle is priced $9 or $12, which is pricey.
A young woman behind the counter told me that they use all organic produce, and a large machine cold presses the produce to keep the vegetable/fruit enzymes intact.
The shop also stocks several different kinds of snacks for grab and go. I saw cacao cashew, dried golden berries, dried mango cheeks, and something else (I don't remember).
At the front of the shop is a small rock garden with bench.
I walk by this place on my way to the Whole Foods Market on Rose Ave & Lincoln, so I'll bring my husband with me next time to try the different juices.
Cons: not cheap