whirly bird, any difference betwwen them?

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im thinking of getting 2 whirly birds for my roof, if there any difference between getting a all metal one and getting a clear top one?
what one would you get and why??


Read the full thread at RenovateForum.com... (http://www.renovateforum.com/f78/whirly-bird-any-difference-betwwen-them-78736/)