On a recent trip to SFO, I was seated in first on a brand new 777-300 with the Polaris cabin. I have been on other flights with “Polaris” branding but the cabins were not the upgraded ones.
The seating config is 1-2-1 and the seating pod is more enclosed and private if you will.
I found that the space for my legs and large size 11 feet was a little small, but overall the seat was very comfortable and relaxing.