I came to know about the Divi theme from Elegant Themes last year. I handled it several times and bought it the other day.
There are three plans in Elegant Themes: Personal, Developer and Lifetime. I purchased the cheapest one - Personal. The Divi and Extra themes incorporate Divi Builder. I think the Personal plan is suitable for me because I will use only the Divi or Extra themes.
At a glance, Visual Builder of Divi Builder is good. It will take some time to be familiar with it. The Divi theme is a clean multi-purchase WordPress theme.
Currently the Enfold theme is used in my main blog. I want to change it to Divi or Extra in the long run.