Mr. Rawles:
I bought a cheapy Chinese plastic model (“Dynamo and Solar Radio” model, in a small black rectangular plastic case), and it worked okay for a couple weeks. Then the flimsy plastic crank handle broke inside the unit. At least the solar cells seem to recharge it okay if left in the sun for a few hours. The Eton/Grundig ones [4] seem to be well constructed I hear, but now perhaps a better one is coming with a Sony model being released in Japan [5]. They are usually pretty good about testing ergonomics and durability much more than most companies.