In fact, Apple introduced two new iPads this week: The fourth-generation of the regular 9.7-inch iPad, which replaces the third-generation model released back in March, and the iPad mini, a smaller-screen version (7.9-inch display).

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The clip doesn't feel as strong as on the third-generation model.

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That upgrade arrived seven months after the third-generation model.

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With the new, third-generation model, it still holds that crown.

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Comparatively, the fourth-generation iPad shipped seven months after the third model arrived at retail.

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The third-generation version keeps the angular look of the current model, but the creases are less severe.

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Many car buyers wait for a second- or third-generation of a model of interest before buying to give the makers a chance to smooth out undetected problems.

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The compact Nissan Cube wagon was already in its third generation when it finally came to the U.S. for the 2009 model year, and was wildly popular among younger buyers back in Japan.

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