I have a kindle. It does not replace books, but can be handy to carry around. I find that I do not like it for nonfiction. It is designed for reading books beginning to end, which is fine for fiction, but not for nonfiction if you want to jump around.

Classics = out of copyright. Beware of when you can download all of a given author or set of related books as a single free package - they do not spend time setting up a table of contents on the freebe books, so you pretty much have to start with book 1 and go thru it linearly. I now download individual classics instead, so I can find them.

There have been previous threads:
kindle 1
kindle 2

The second deals with using a kindle for song words