I'm a huge fan of both.
I love actual books, but when I sit and read for long periods of time, I get fed up of holding the book open (I tend to read big books... Game of Thrones and the such so they're usually heavy!) and plus I tend to drop them on my face when I'm lying down
My Kindle on the other hand can be held in one hand, I've got 150+ books to hand so I can read whatever I fancy, and it fits perfectly in my handbag!
I use it everyday at work and read on my lunch break. It's ideal because to turn the page you just have to press a slim button on the side of the kindle and voila! You're on the next page
No scrolling involved like you would on a iPad or iPhone (or similar tablet/phone!)
Plus it's ideal for me as I'm also a fidgeter, so I can move all I like and still keep my Kindle in one hand