As you wait in line for the elevators (or are whisked past the line if you got the "sky ticket"), there's a display showing how much taller the Burj is compared to other buildings. The one on the right is the Petronas Towers which I toured a few years ago.
For some of the fastest elevators in the world, they don't exactly scream "One of the Fastest Elevators in the World." Inside, LCD screens show the other tallest buildings in the world, and you rise past them as you gain commensurate height. Even at floor 123, where you exit and go to another elevator to go even farther up, you're higher than nearly every other building on Earth.
Mindblowingly, there's an outdoor observation deck, a third of a mile in the sky. Even more amazing, there are gaps in the walls so you can stick, lets say a GoPro, out and take some amazing photos (you probably shouldn't do this).
The surface of the building is covered by 70,000 LEDs and at night it lights up like a giant screen! Colored patterns weave their way across and up and down. It's one of the most amazing things I've seen.