First into the breach were competition winners Katie Mitchell and Chantelle Polley.
They fearlessly applied to be the first to try out Hackett's mystery device, before even knowing what it entailed.
Katie Mitchell from Tauranga had done a few bungys before, "but this was something else!"
The Kiwi daredevil entered the completion by submitting a video of herself doing other bungys and a skydive to prove her mettle, but nothing could have prepared her for a giant bungy catapult.
"We were only told that we won only last Monday. [We] didn't know it was a catapult until we came out here early this morning for the 'blessing'."
After a quick demonstration by AJ Hackett Co-founder Henry Van Asch – Chantelle Polley, from the Sunshine Coast, was second on the catapult.
"There was a call out for Aussies on Instagram asking for the most exciting thing I'd done," she said.
"I'd done the Nevis Bungy before and one on the Gold Coast but the catapult is really the next level.
"You get swung forward like you're flying. It just topped everything."
The 150 guests at the launch party also had a chance to try the catapult, including MP for Clutha-Southland Hamish Walker.
As of 1pm today, the Nevis Catapult is now open to the public.
"I'd say beginners could do it but it's nice to do a bungy first, to feel how different it is," said Chantelle.
"We've got to have a go at everything here, including twice on the Nevis Swing. So I'm well and truly adrenalin-ed out," added Katie. "Though we're booked in for the Ledge Swing tomorrow."
"The speed is extreme. It's really exciting – and surprising," said company co-founder Henry van Asch, who has been central in developing the one-of-a-kind attraction.
Helping to launch commercial bungy jumping in the 80s, he has made a business out of seeking new thrills.
"I did my first version of the catapult more than 30 years ago – in 1987, a year before AJ and I brought Bungy jumping to the world."