Microsoft and I believe Qualcomm research took this and did two follow-on versions. They gave a joint keynote talk at ISCA (2018?) on their experiences, but I can't seem to find any slides or video on it.

I recall them saying it looked to give them roughly the same performance as state-of-the-art processors with ~30% less power; but that's a hard gamble for the $100Ms required to get to a product (especially if it requires a new ISA).