Kindles are great.

Excellent for reading fiction. Plenty of low cost and free titles available. Also excellent for travel, much less bulky than books and you can make sure you have plenty material available so if you finish your current book, you have something else.

I also now have song words and dots of tunes on mine in pdf format. Makes a useful reference and I can carry songs I'm learning about with me.

Not so much use for a lot of non-fiction. OK for non-fiction you read end to end such as biographies, but not for reference works.

I occasionally have to give a talk and the kindle is a very useful way to carry a copy of the talk.