E-readers have quickly become a preferred method for readers since they can hold hundreds of books in one device. And many e-readers now have features that let you take notes or highlight passages in your book, avoid glare from the sun when reading outside, and read at night with a backlight.Also: The best tablets for reading you can buyI reached out to published authors for their take on what the best e-readers are for reading or annotating books. Here's what they said.Authors' favorite e-readers Perhaps the most popular e-reader on the market today is Amazon's Kindle, thanks to its easy-to-use interface and the widest selection of books in its library. Sandra Beckwith, an author of six books who also teaches other authors how to market their books, said she uses Kindle as her e-reader. "I use a Kindle because I buy e-books on Amazon, which delivers them automatically to my device," she said. "The process is quick and easy -- I love a good easy button."Review: One of the best E Ink readers I've tested isn't made by Boox or KoboThe Kindle Paperwhite is our pick for the best Kindle you can buy, since it has a large 7-inch display (the previous generation was 6.8 inches) and is thinner, making it even more comfortable to hold while reading for hours. It has all the familiar features of a Kindle (300 ppi e-ink screen, long battery life, and adjustable warm light) as well as a waterproof design so you can read by the pool this summer.