I live in Macau and I've done the jump. I did it back when it was the Sky Jump. Instead of a bungee it was a controlled 70 km/h descent on a steel cable. It was only scary for half a second then you just sort of hung there going down.
This one is pretty fun though and because the bungee is so long it slows down rather gracefully and doesn't yank your spine violently.
The hardest part is about the minute or so it takes to lower you down to the air cushion during which your blood starts rushing to your head so you have to stare at your feet.
You also get a card so your second and third jumps cost something like 60% and the fourth one is free.