I love the mix of books they offer; there are books about everything you can imagine and quite a few I couldn't imagine. Slavery and Four Years of War, Vol. 1-2, Wood-Carving Design and Workmanship, The Essentials of Spirituality, English Walnuts — What You Need to Know about Planting, Cultivating and Harvesting This Most Delicious of Nuts and McGuffey's Eclectic Spelling Book are only a few.
The border above is from Handbook of Embroidery by L. Higgin.
Books that are not available in other places at least not in Sweden — can be found at Gutenberg. I don't know how many years I've been trying to find a copy of Marie Bashkirtseff's diary — at least for 30 years. Gutenberg has it!
But I have to admit that I prefer to read real books. I've heard about a "thing" smaller than a computer you can use to read e-books but nobody I ask has heard about it.