In a world full of full-color tablet displays, it may seem surprising that dedicated e-readers are still around. But these devices actually have an advantage over tablets that avid readers appreciate — the e-ink displays are much easier on the eyes than backlit displays. They allow for comfortable long-term reading. Today, Rakuten announced a new Kobo e-reader called the Clara HD. It’s a 6-inch device with an HD 300 dpi screen at an affordable $130.