The A16FX is a deluxe model with a different faceplate, better sound dampening, and different firmware. They’re usually only sold in Asia, or specifically, Japan.
However, a 116D can be crossflashed with A16 firmware, turning it into essentially the same drive, minus the cosmetic differences.
The Pure Read and Power Read features are only available when you use special software. They do not work with standard burning, testing, or ripping programs.