I read part of it, but didn’t finish it. It was pretty heavy on the language learning aspect with integrated lessons and quizzes. I learned enough of the version of Esperanto in the VN (Juliamo) that I could follow along as I was reading it, but it did not stick with me long term. I had to take a break for a couple weeks due to circumstances IRL and I found that I’d pretty much forgotten everything when I tried to come back to it.