No worth it. Such a hassle. Everytime I would have enough ivouchers to read a chapter, I would open the book and it would say "network unstable". The app would take my ivouchers as if I bought the chapter but would still owe for the chapter I supposedly bought. They won't give me back the ivouchers and the chapters are too expensive. They won't help me out at all for their apps problem. And because this has happened more than once, it's not worth spending actual money on. Made me very wary.