I think pretty much any solar radio would be all right for an emergency kit. It's doesn't seem too hard to make a decent solar-powered radio, in the same way it's uncommon to find a really crappy solar powered calculator.

However, the battery part of solar powered radios leaves much to be desired, particularly because most don't allow you to easily replace them when they go bad, which is important since these radios are often unused for long periods.

Personally, my favorite solar radio is any of the original Freeplay radios that used either solar or a spring-powered crank. The spring is never going to go bad from just sitting in the closet. I have the big, tabletop model, although they made the portable model with a spring, too. Even in complete darkness, 30-seconds of winding the spring will give me 30-45 minutes of radio, depending on the volume. I have a newer Freeplay and I don't like trying to charge the battery with the crank. It takes forever, and you never know when you're supposed to stop cranking since there's no "full charge" indicator. It's like wind-up flashlights--sounds good on paper, but I don't find them that practical in real use. However, some people don't mind, so if you've never tried it, please don't let my preferences totally dissuade you from giving one a try.