From top to bottom: - new icons look horrible. In a utility app like this, previous ones were just perfect. Revert them, or design a Mac-looking ones. - there was no reason to change standard column design - they don't look good in current OS look, but better than this. - tab design sucks all the way. - display area bellow tabs is beautiful in it's simplicity. Also, new progress bar looks better, but it should remain green. Overall, it doesn't look like a native Mac app anymore.