There are practice exercises and tests. The cultural notes are short, usually just a paragraph, and include simple comprehension questions. The vocabulary is extensive and is arranged conveniently by alphabetical topics. Of real benefit are the hundreds of idioms, which are clearly identified. This site is composed of twelve lessons with exercises, answers and a self-test, making it easy for students to use by themselves.
Topics are simple and represent a nice variety of everyday subjects.
Readings have pronunciation guides and English translations. The Humor section at the end is very entertaining, which would engage students, but the colored background makes it a little hard to read. The Appendix includes additional instruction in subjects like the use of the articles. This site is rich in vocabulary and verbs. It includes a discussion of 20 common errors made by English speakers learning Spanish, which would help students avoid that hybrid language they often speak, Spanglish.