I have used this plugin on dozens of sites. I have never been able to break it. It's been a huge asset!
As you'll see in the review results, it's not for everyone. If you're strictly a WYSIWYG type of person who loathes code, you will have difficulty, so don't bother. And the interface isn't all pretty. After making your templates, you may need to go down to the other options and look around.
I use it to display stuff on the sidebar with shortcodes (go to Global Settings, and be sure to tick "Use the shortcode in the widget" and possibly "use autop function"!), and just about anywhere else in a theme. If you want to put custom fields into certain spots in your theme code, some PHP is required. I am a theme developer, so this is a cakewalk for me. If you're not, you may want to try ACF.
Big, big thanks to Mr. Miyashita!