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Opinions on the future of E-books vary. Authors John Updike and Ray Bradbury are anti-E-book and have both been quoted criticizing E-books. Meanwhile, simply because E-books don’t require paper doesn’t mean they’re completely enviro-friendly: the growing number of computers and electronic devices in the United States has begun to create a disposal problem. These devices use elements such as lead, mercury, and chromium and usually end up in landfills. A recent Salon Magazine article noted that "consumer electronics constitute 40% of the lead found in landfills."
    Then there is the size of the readers—or, more precisely, the size of the type on the readers. A PDA’s screen is only a few inches square: to read a book on a PDA requires lots of squinting and scrolling. E-book readers are much more like paper books in terms of front size, but reading them can be like looking at a computer monitor—with lesser models, a monochrome computer monitor—for great lengths of time.
    Nevertheless, the technology continues improving. Microsoft released its MS Reader, whose interface emulates the printed page, hoping to make extended E-book reading more comfortable.