I think one key thing to point out about Pattern Manager by WP Engine is that when you save, it doesn’t go into the database. It pushes out a pattern PHP file for you, on your hard disk, inside your theme. This makes it different than many other (also great but different) pattern helper plugins, and is really geared towards simplifying the process of adding patterns to a theme, and updating those patterns over time as well. It copies images used into the theme for you as well. This is ideal if you use something like git to version control your theme.