I don't understand this fixation on having the newest and greatest software.

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Well, newer software tends to be better, in that its features are improved and extended and the code is quite often optimised for better performance (just look at the OS X versions, for instance, to prove the latter point). I've never seen the attraction of running old software when your machine will take something newer, which is why I always run the newest versions that I can coerce onto my machines. It's also great to be able to experience the latest and greatest in Mac software without having to buy a newish Mac to do so!