While Sparkle is nice to have a standard way of updating apps, it makes the user worry about updating apps because it pops up dialogs and prompts you to download and install. I would much prefer it just update things for me automatically. If at all necessary, the Chrome approach of "hey, Chrome's been updated. next time you open the app you'll get the new version".

You can do this with sparkle! Our app that uses sparkle runs silent automatic background updates. No prompt for install needed! We could pop a changelog after update, to let the user know there has been one, but most often we don't.