I thought I'd take the time and leave my thoughts, as I don't really understand all the bad reviews.
We flew LAX - EWR; EWR-TXL on United 757-200 International Version aircraft.
I upgraded all except the first flight LAX to EWR.
The seats are definitely much more comfortable, much more leg room (although Im short @ 5'2 and my son 5'5) it was a world of difference compared to being in the middle or back of the plane in those tiny seats.
I think I chose the best row... row 8, right behind the bulkhead seats.... in front of Economy...
I paid an average of $100 extra per leg to upgrade (less on the LAX-EWR flights)
I have a fear of flying (a lot) and this is the first time in years I felt a little bit more at ease with the flights... maybe I have a fear of being enclosed? because the front is much more "open"
The service was also very courteous from all the flight attendants.
Not sure why all the bad reviews... but even though my 1st ever United flight was not a great experience, I have to say, they are an A+ in my book.