At work mine falls back to 1xRTT in certain places in the office. When I first got it at least, I could not do web browsing when it was in 1xRTT ("failed to connect"). I did not try accessing the store or downloading from it, and I have not tried since to see if perhaps it was a "provisioning" issue where the older network hadn't fully registered the device or something.
Book downloads are only 1MB or so and I doubt that you'd notice much difference in 1xRTT for that. Web browsing would probably be noticeably slower and supposedly 1xRTT eats through the batteries faster.
Z.
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