This place is amazing and I would recommend going to this grocery store as opposed to any other if you can.
First off, there is a variety and diversity in the foods/produce. For example, there are the common produce you would see in normal grocery stores, BUT there are additional items such as white squash, Japanese sweet potatoes.
There is also a giant selection of healthier brand foods (I've never even heard of). So in addition to what you normally see, there are healthier options.
Not to mention that the items are tax-free.
There is however a "surcharge" which is a % of your spending that goes specifically towards the commissary. It's not much, our bill was 104 and the surcharge was $5