Subscription and one-off purchases available. Drinks come in powdered form, add a sachet to a cup of water/soda water.
It has a somewhat mixed reception, some find the taste too unusual or gross. I managed to get a free sample and actually preferred to the other energy drinks.
Recommend you get a free sample here while it still lasts: https://www.ozbargain.com.au/node/332927
For me the biggest incentive to an energy drink is that I can just grab one out the fridge before I rush off to work.
When it's powdered, I may as well go to my local supplement store and pick a pre-workout out from the 100s of choices.