just because the display will work in the sun doesn't mean the rest of the electronics aren't going to overheat.
personally, i'd rather have the safety of a device shutting down because it's too hot than one overheating and destroying itself. remember, the ipad has no fan to keep cool with and no ventilation, heat is dissipated through the back panel, hardly an idea mechanism. apple could have added vent slots, which let dust and dirt in, or a fan, which would have made it thicker and loud, not to mention the impact on battery life.
expect this to be an issue on any tablet that is released, they are all going to have to address heat issues somehow. we'll see what manufacturers come up with.
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