Great device for reading. It has the same feeling when you read a book and the chargimg life is great for me I will read 50-80 pages a day and I will get the battery life for 1 month 30 days . The good part is that it shows pictures like the normal book and doesent hurt the eyes I think few people will want to read books while they sleep. If they want to do that then they need to use a bed lamp as that is sufficient light to read the book.
If you really want to read in loght then go for paper white . They both offer us with kimdle store which has all the books. You can also upload or publish your book in the store. It is like carrieng millions if books in ome small little rectangular device