I recently had the opportunity to fly United Polaris business class from San Francisco to Tokyo on a plane.
It wasn't close to the best but it wasn't bad.
Pros
Direct aisle access was available in all seats (seats were arranged in a 1-2-1 configuration).
Seats were more comfortable than most business class seats, especially when flat
United provided two pillows and a blanket. One was a standard size pillow and the other was a small memory foam pillow. I really loved the memory foam one.
We chose bulkhead seating and had tons of legroom (we had previously read that bulkhead seats offer more legroom).
A divider between middle seats can be raised or lower depending upon whether you want to talk with or want privacy from the person next to you.
In flight wifi was very fast while it was working
Cons
There is no privacy door
Service was inconsistent
Food was mediocre
No extra padding or pajamas were provided for this 11 hour flight (my understanding is that pajamas are available for flights of 12 hours or more)
In flight wifi cut out for a few hours in the middle of our flight