I was vegetarian for a few years and I am now vegan. Mustard Seed is a great place because they carry a lot of stuff for people with special dietary needs. Lots of vegan, vegetarian, and GF options available. The store also has prepared food and baked goods, again available in vegan and GF versions as well.
They have a really nice and well stocked bulk food section and a decent selection of produce. I must admit, it isn't super cheap like a Walmart or Aldi's, but I go here for specific items I cannot get in other stores. I do my other shopping at Aldi, Walmart, and Giant Eagle for the "normal" stuff.
They have a place where you can sit and eat any prepared food you buy and a juice bar to.
The place is clean and the people are friendly.