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I think Readius can be your only eBook reader, so you could replace conventional eReaders with it. But you can't replace your smartphone or PDA with any eReader:-) It's more comfortable to read eBooks on eReaders than on smartphones (the battery lasts much longer, no problems with sunlight). And it's more convenient to call with a smartphone than with an eReader:-) That's why "many people use multiple devices for different purposes", as Karl said.
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