Saw it for around this price on Catch (Gearbite) this morning but it vanished; then saw it for about the same on Kogan. Only 2.00% cashback (Cashrewards) compared to Catch's current Black Friday 7%+ boost, but hey, I snoozed and lost and this seems the best deal available.
I have the "regular" S5 and have not used the mop function, as it can't differentiate between carpet and hardwood and didn't want a wet carpet. The Max, however, has a bigger water tank for bigger hard floors and room selection ie I can stop it mopping my living room carpets! It's no iRoomba S9+ but for someone with a mix of carpet and hard floors, this might actually be more useful.
Yes, this is an international model so no Aussie warranty, but my S5 (which I'll stick in my parents' place, which doesn't need the mop) has had no issues despite frequent use.
I stacked it with the CommBank Kogan $30 cashback on $100 Kogan spend offer: https://www.commbank.com.au/digital-banking/rewards.html#:~:....
I miss out on the Amex extended warranty goodness but I wouldn't have that anyway given it's not an Aussie warranty.