I had the very first Kindle when Amazon first brought it out - it was one of the Kindles with the full keyboard. I absolutely loved it and it lasted me a good three years but after I dropped it into sand one too many times at the beach, it died - and so I had to get a new one
Santa brought me this Kindle Paperwhite for Christmas last year. I chose this one over the Kindle Fire - although I loved the idea of the Fire, I ended up opting for the Paperwhite because I knew that I could read it in all lights - bright sunlight on the beach and pitch black at night if I so choose. The Fire, on the other hand, is LCD and so I don't think you'd be able to read it in bright sunlight.
One of the things I like most about this Kindle over other Kindles is that it displays all of your books very neatly, and their covers, on your home screen - like so:
It's all controlled by touchscreen which can take a little getting used to - and can occasionally be a bit temperamental - but it's still very good. There are a huge number of functions so I'll go into them in a bit more detail now.
When you unlock the Kindle using the button the bottom, it'll take you straight to the page you were last reading unless you were already on the home page. Very handy if you've already been reading as you don't have to go back into everything.
On the home page, you have 6 books - the ones that you either bought the most recently or read the most recently will be on the first page. Scrolling to the left shows you the rest of the books in your library and you can delete them from the library on your Kindle, if you like, so that you can free up space. Not that you need it - there's bags of space on here. If you really don't like a book though, you can delete it but it will still be in your Amazon account and you can download it to your Kindle again for free.
At the top of the Kindle home page, there's a number of buttons. The home button, a back button, the button that controls the light, a button for the shop, a search button and then a button with three lines on which is an extras button, so to speak. This button contains the kindle store, an option to change the books to list view rather than library view, an option to create a new collection - you can group stories into certain sections i.e. if I wanted I could group all of my lovely Harry Potter books together into one collection. You can also sync and check for new items and use the experimental browser. There's also a settings option, where you can switch on aeroplane mode, sort out your Wi-Fi settings, register the device, personalise your device and manage your reading options. I think I've listed everything!
What I like most about the Kindle is that you can easily navigate between books and pages so easily. It's really lightweight in the hand and can be held with just one hand in bed and luckily, it won't weigh you down. It's perfect for reading outdoors in bright sunlight or indoors in the dark as the built in light means that you can adjust the light to suit your needs. That's precisely why I like it so much. The books are also fairly inexpensive and Kindle often hold sales so that you can get books for cheap.
All in all, if you're a bit of a bookworm, like me, I'd absolutely and thoroughly recommend it. I use it every single day, and the battery lasts for about two weeks. It's brilliant, actually. Buy it!