A kindle is enjoyable enough to read on, especially when you dont have space for more physical books.
Sure this is a good price deal for 12 ebooks. But since you dont know what you will be getting, I am too iffy about it. Could be a lot of drab and droll aos reads, which Ive no interest in. In comparision I had no problems signing up for the Beast arises series, as you know exactly what you will be getting.