I use Builder on just about all the WordPress sites I have developed so far, I find it very flexible in terms of its layout options and range of widgets. I’m aware there are a number of similar addons out there but I like Builder as its ‘built in’ to the Themify.me themes I use and also allows me to create my own layouts on pages I create.
These days most of the stuff I do is in WordPress and I still like the ability to drop widgets into place and create a layout without having to dive into HTML and CSS most of the time and still be able to do this when I need to.
The main features I like in the update are the new, cleaner and simpler ‘front end’ (combined with live preview, to see how I am going as I do my layout) and the increase in the number and options available for widgets in the back end.
If you are new to WordPress, I can recommend Themify.me for the variety of what they offer as a member. You may not need it all at first but in my own experience I have used quite a lot over the past few years since I’ve been a member and the membership has paid for itself.