Confidential transactions have arrived, a dive into the AZTEC Protocol

Aztec protocol keeps the amount private, but not the participants (Nightfall hides both).It currently costs about 900,000 gas (0.5$) to issue a confidential transaction that contains 4 notes (this is the total gas cost, not just the cost of validating the cryptogrpahy of a transaction). If/when EIP-1108 goes live, the gas costs will fall to about 200,000–300,000.

What do you think?