First of all, it's free. Though it's free, it doesn't mean its anyway lesser than other softwares. It's a booming 3d software.

The ease of using the tool. Most of the nodes are self explanatory and is sorted very efficiently. Also, the node based interface helps in reducing issues with the project you're working on as we can easily get back to the roots to get something changed at a later time.

The possibility of creating any type of Fx from scratch. It's mind-blowing how much the software can offer. The biggest advantage is the network system which offers an organized and multitude of combination to even go beyond your imagination.