The multiple members editing mode is very useful when you are working on interfaces and iterate live with your teammates to make decisions or proving new or multiple ideas, or even if you are only brainstorming trying to solve user problems through designing interfaces for the customers.
The prototyping tools are very useful, before we were using invision with sketch but after trying Figma we really love that it has within this excellent tool, the scope you can get with the prototyping tool is very huge, from transitions, micro-interactions to adding gif animations is very helpful for me and my team members through the company.
The whole tools that you are enhancement constantly are so awesome, because in most of the cases you are better than the other designing software.
The Figma mirror tool and app is really useful too because you have the real context in which your interfaces will come to real life.
The browser mode is also great because it doesn't matter if you don't have your computer, if you only get access to the internet, you can edit, iterate, and export your changes.
The SVG export tool is awesome too and the zeplin plugin is very useful for the frontend developers. Review collected by and hosted on G2.com.