I carry a Nexus One and a Blackberry Bold. The iPhone I mostly leave at home. It is too slow. If it was as fast as the iPad and it had multitasking I would probably take it instead of the Nexus One. But what defines what I take out with me in the end is the way information is input in the device. The iPad, the iPhone are spectator devices. People who have to frequently express their views prefer devices in which input is easier, like Blackberries.
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