I flew United Polaris RT from EWR to SFO. I was in 1L and 3L and I thought the seat was amazing in many ways and the cabin was beautiful. I spent a lot of time exploring, studying and grading the details.
It is a mini version of the United Global First seat. Not as much room or storage but actually even more private. Just like the seat in Global First, the forward facing seat has 3 windows (one with a mini shelf, something I have never ever seen before below a window). I thought the details were very well thought through. There was plenty of storage: the small cabinet with the mirror inside, the space below the TV screen, under the footrest and a small cubby hole for your glasses or iPhone and naturally the 777 overhead bin. The counter-top in faux marble and sconce light were nice touches and the industrial design (like it or not) was distinctive (it felt unique to United and NOT an off the shelf solution).
Mr Munoz said numerous times that their research showed that "sleep" was the single most important thing to passengers and they did deliver on that in spades. It was the "flattest" of any bed seat I have ever been in, no lumps or bumps, no slight angle, and long (I am 6 feet exactly and there was plenty of room both above my head and below my feet. The new eyeshades totally rock! The brushed metal handle bar above the TV was great to help you lift yourself out of your seat. Also the linens from Saks Fifth Avenue were really soft and elegant for fire retardant material!
The lavatory was also beautiful (mostly because it was a brand new plane) but also for the 4 "COWSHED" items on a nice shelves and custom wall paper that matched the seat and cabin.
The bulkhead sculpted relief and "POLARIS" sign were really nice, but the entry-way wall signs that are back-lit that truly stand out as exceptional. It might be the first time I have seen the CO globe and liked it. (execution is everything!) So, yes, I was very impressed, Polaris is a huge leap forward from the current flat bed. And the crew was great.
In the end, I'd give it an A-, it may not be the most luxurious seat in the sky, but anyone who would really "complain" about having to sit in a Polaris seat would be (IMHO) a snob. It's plenty good enough!
To Most the Sky is The Limit, For me, the Sky is Home.