I like the security, the layout, and easy usage.

The clean and focussed (no distractions) interface. Having one application with the essential tools for communication in distributed work teams: chat, call, video and screen sharing. The easy guest access (e.g., for meetings with customers and contractors) by sharing a link by email.

Very convenient and easy to use. Installation is very fast as well. I use it all the time and it became essential in our business.