Useful if you are designing a static website
Basically, you can start from an existing theme (or you can create your own theme using html/css) and you drag and drop elements to create a webpage.
I quickly whipped up a website for my dentist using it. I liked it quite a lot. You can use it for free for the most functionalities. Even the paid one is not expensive at all (cheapest one being $8/month).
Thought it might be useful for you guys.
Brian