The owner/user reviews of various models on amazon.com provide some pretty good insight (search: noaa warning radio s.a.m.e.).

Here's link to Weather Receiver Forum on Popularwireless.com. Participants appear to be the weather radio-version of ETS-geeks (that's a good thing <img src="/images/graemlins/grin.gif" alt="" />).
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"Things that have never happened before happen all the time." — Scott Sagan, The Limits of Safety