I like that it is easy to use, has many options for customization of pages/widgets etc., very good support (responding quickly when you need help), great marketing platform with lots of tools available! Some things are tricky at first but once figured out they can be used quite effectively in your content management system or CMS such as WordPress if using Wix's website builder toolkit - which we do not currently offer our clients because there aren't enough hours per week needed by one person to maintain them all since most web designers have their own websites built from scratch without any assistance after initial design work done).
We've been able to create multiple landing page templates within minutes instead of days and weeks.