Programming books are often thick heavy and expensive. My experience of kindle is on a nexus 7 and on the desktop version. I can't speak for other countries but for the UK we don't pay tax on e-books so they are a lot cheaper. Just the fact that I can take my library of books anywhere is brilliant. Some books diagrams are hard to see as they don't always scale properly. The choice of books is sometimes more limited but more are being added all the time.
So long as you read the reviews of the books before buying and do your research, and if there is one try the sample before, you will be ok