When I first saw the Divi theme from Elegant Themes (ET) I immediately fell in love with it. The theme is flexible enough to create ANY type of website with a drag and drop interface and loads of different modules for any purpose you can think of.
I started using Divi immediately as I had to develop the new website of the company where I was working at the time. Development was fun and fast. And although I have a 24″ monitor I was still a bit annoyed of the unused or not effectively used space by the Page Builder. So I decided to tweak it a bit. Some of it has already been implemented by ET in v2.0, but there are still some tweaks which make better use of the screen space.