I hate about X when it doesn't let my Custom CSS load from the child theme's style.css and force me to add in the theme options. :( It's convenient to update or edit the Custom CSS from the child theme via FTP rather than going to each time in theme options.
The customization options are pretty great, but the UI can be very buggy. New features are rolled out regularly, but editing even simple posts can be frustrating at times. Getting the design to look how I want it is a bit of a chore.
Overall, it's a good theme to start off with, but I'm moving on to a different theme.
While it's true that bugs are a common part of software development, it's important to keep in mind that many 'bugs' are the result of the interplay of theme, hosting, and plugins. As far as our product is concerned, if and when bugs are found they are fixed in short order. With regards to editing post, most people don't use a page builder to edit blog posts (although you can), so if you are having an issue with that, we'd be happy to take a look in the support forum.