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It's a function of how much access you have to wifi compared to how much need you have to download books.
The more access to wifi you have, the less you need 3G. The more you need to download books, the more likely it is that you'll be glad to have 3G.
I'd say anyone who has access to wifi once a day is wasting money by buying 3G. But if you only have access to wifi once a week, you'll probably find 3G to be very nice indeed.
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