The thing that really makes it stand out is the multiple cursors. You can go very deep with them because everything that happens in the editor happens in parallel for each cursor. They each have their own clipboard, any scripts you run happen once per cursor. "Find all" can be made to select all the matches. You can do some crazy stuff. I love it.

However, if you've customised and become proficient in vim to any serious extent it likely won't be that impressive to you.