I resisted for years. But I couldn't live without it now. Some of the advantages -
Small, lightweight, easy to put in your bag. Great for reading anywhere, especially holidays you just have to take the Kindle and not 10 heavy books. If you are on holiday and you have finished all your books then it is so easy to get another.
I always read in bed for half an hour before sleeping, no need for a book light, noisy page turning, far less likely to disturb your partner if that may be an issue.
Generally cheaper books, a lot of free books.
Far more availability than in shops of anything you might want to read.
I live abroad and it isn't easy to get English language books. Now I can get another in seconds. The same if you live in the country whee books in your language plentiful, no need to leave the house to get your next book.
I really had no more space in the house for more books, I hate disposing of books but the house was literally full of them.
Always having it with you to read something even for 5 minutes. So portable.
Disadvantages -
None really. Unless it dies or you lose it and then you are in an absolute panic 😁.
I thought I would miss the page turning of a real book but I really don't. I wouldn't be without it now and can't imagine going back to books. The only ones I buy now are travel guides with maps etc., as they aren't so easy to read on a Kindle (although available).