This is a great place to find organic, non-GMO, natural food items, and pretty much any vegan staple you could ask for.
Having said that, the items are incredibly overpriced and the store is bursting at the seams with yuppies who suffer from an undeserved sense of entitlement. Expect to deal with people who will take up vast acres of space in the aisles and ignore you as you try to squeeze by. Expect to wait in line behind people who waste time with last-minute decisions that should have been made prior to queuing up. Expect to be mowed down by huge SUVs in the parking lot.
Better prices can be found at Sunflower and Trader Joe's. A more humane environment can be found at the Food Conspiracy Co-op. But Wild Oats might be the kind of place you'll want to avoid at all costs, given the many alternatives you have in Tucson.