Seems a good deal to me. $29 per month for 24 months. 32g 6th gen iPad with 10gig of data per month then throttled to 1.5mbps. So that's $696 for the cellular iPad (currently $667 at officeworks) and 240g of data over the 2 years.
Plus I got $150 cashback through my work run cashback site, ymmv but that took my total down to $546.
How much is the excess? For a $700 device, you might want to weigh it up at least for theft. For accidental damage, at $99 AppleCare+ is not a bad deal compared to what Telstra charges, but it's only for two years and only two goes at it ($65 Service Fee):
https://www.apple.com/au/support/products/mac.html