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We have extensively tested nearly every current e-reader over the past few months, flying through novels to determine which devices are the best ones for readers across the price spectrum. Typically, the ads will be for romance novels available with a Kindle Unlimited subscription. If you choose the ones with special offers, you will see ads on the lock screen instead of a neutral screensaver or the cover of the book you're currently reading.
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It's important to note that Kobo devices each come in one version, while Amazon sells each of its Kindles in two: with special offers (ads) and without.
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Kobo, Amazon's main competitor, has a wider range of devices now, offering six models to Amazon's three. Current models run much faster and are more portable than older ones, but Amazon hasn't been the only brand making its mark on e-readers for some time. E-readers have come a long way since Amazon introduced the first Kindles in 2007.
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