These are a good set of stories. They are for children, I would say, but they were still entertaining to me as an adult. Obviously, written for Legends, not the modern canon... But better because of that.
I would say that the first and third stories are the best. I appreciate that even though I am jumping into the middle of a story, I was not lost.
This was a highly enjoyable series of books, I always loved Jaina and Jacen as characters. This series chronicled the twins adventures at the Jedi Academy, and the foes they faced as they learned how to use the Force and become Jedi themselves. The supporting characters, especially Lowie, Tenel and Zek were my favorites. They would go on to prominent roles in the EU novels, as would the twins. Looking back on these younger books, you can almost see some of the seeds for the types of characters they would become. Of the first six in the series, the last one was my favorite. It was slightly dark, and extremely action packed.