It's helpful, but could be better. Most of its passages are not science related and not very dense. I have more time left over when doing these passages than when doing Topscore or Kaplan passages. But it's good practice for reading, taking notes, and answering questions with a time limit, and it has a lot of tone/inference type questions, if you want practice with those. I do wish that there were some dense science passages, but I'm still glad I bought it. I don't know of any other product specifically geared toward the DAT RC section, so if you need help on that section, I recommend it.