I actually tested out the page refresh rate by trying the display ereaders at a local office supply store (Office Depot and Staples probably have display Kindles), and I tried the Nook at a Barnes and Nobles, the iPad at an Apple store, and the Kobo at a Borders (before it closed, but the office stores might have display Kobos now too). If you're near any of those places (generic big-box stores like Walmart and Best Buy might even have display ereaders), I definitely recommend them for trying out ereaders.
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I actually tested out the page refresh rate by trying the display ereaders at a local office supply store (Office Depot and Staples probably have display Kindles), and I tried the Nook at a Barnes and Nobles, the iPad at an Apple store, and the Kobo at a Borders (before it closed, but the office stores might have display Kobos now too). If you're near any of those places (generic big-box stores like Walmart and Best Buy might even have display ereaders), I definitely recommend them for trying out ereaders.