HI,
I am trying to put a Quarq on a Shimano, Ultegra 8000 DI2 groupset

Quarq website says:
Quarq Dfour Dub Power Meter
"Designed for Dura-Ace® R9100 chainrings. Compatible (it will not match aesthetically) with Ultegra® R8000 and 105® R7000 chainrings."

Does anyone have any experience with this?
1. Does it shift OK?
2. How bad is the color mismatch?

Thanks!