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Actually, it isn't "automatic" in the Windows sense of the word. Applications with Sparkle just pop up an alert saying a new version is available (much as it does already). The only difference is that if you want the update, you click "Install" and it downloads everything and updates the program while you run it. A simple restart at the end of the process and it's all done. So really the main difference for the user is that you don't have to go to a web site, download a DMG, mount it, drag it to Applications, and run the program. I think it is also more efficient too, since it only needs to update the parts that have changed as opposed to getting the whole thing every time. I could be wrong on that last one though.

If you don't want the update, you just skip it.