This seems like misleading advertisement to me. They claim to be 30x faster than the Arnold CPU renderer, but of course most people use the GPU renderer, which

This seems like misleading advertisement to me. They claim to be 30x faster than the Arnold CPU renderer, but of course most people use the GPU renderer, which this tool doesn't support and which is potentially 100x faster. So they are comparing their main speed claim against an outdated and known slow implementation. Also, vray (another renderer) ships with a variety of lens shaders and if I recall correctly already decouples main rays and camera focus rays. What I agree on is that having more realistic lens shaders is great and that they should be fast to calculate. But since doing bokeh in post is good enough for Hollywood movies, I'm not sure if their solution offers a large enough increase in image quality to justify the surely large increase in rendering costs.