Black is reserved for their premium card. NAB have a similar product https://www.nab.com.au/personal/credit-cards/nab-straightup-...
Yes the chunking into 4 payments, is the primary benefit of BNPL. It allows you to buy something significant (i.e. a laptop) and spread the payments over time.
The downside is its very easy to overspend and get stuck in a debt spiral