Most of their food is quite expensive, but you will find some bargains.
Some of their spices are nicely priced, but they seem to have cut back on their selection.
Meat prices can be competitive with supermarkets, if you buy the premium stuff. And they have levels of beef, for example, so there's no antibiotic/no hormones, then a higher level would be that plus grass fed, and so on. I like ground sirloin, which I can't find in local supermarkets, so I sometimes shop at Whole Foods just for that.
They have a good selection of gluten-free foods for people with celiac disease.
Some of the "health food" type items are better priced than at other stores. One example is Bragg's apple cider vinegar, which is $2.99 there vs. $3.99 at a local supermarket chain (Giant).
The buffet section at the larger stores is excellent, but quality and selection vary by store. Besides a salad bar and soup area, you may have a few hot food buffet areas, such as a vegan one, a comfort foods one, one with a selection of ethnic meat dishes and sides, a sushi area, a "smokehouse" grill area (these last two aren't buffet - you order and they cook it). There may also be a dessert buffet area. Pricing is no worse than eating out, I suppose.
They also have a deli/prepared takeout section, and depending on the cooks there, it may be wonderful or not so great.
Their baked goods are gorgeous, and some are worth the prices.