Deal is kinda meh, but it better than nothing if you need to be on Telstra for coverage and need that much data each month.
Would be better if it was across all tiers, and it was permanent and doesn't expire in 12 months.
Here's the blurb from their site.
Get $240 off over 12 months on a new Premium Upfront Mobile plan.
Offer ends 12 October unless extended.
Based on $20 per month off for 12 months. Accounts starting with 2000 will get a monthly credit by the second month. New services and plan price upgrades only. Minimum cost $900 (including discount) if you stay connected for 12 months. Price may increase by CPI annually in July.
I have the same plan with jbhifi for $49 a month