We have travelled Premier Economy the last three times we have been to the US, we love it, I will say however the width of the seats isn't any wider than economy and I am a larger lady the remotes are rather stupidly in my opinion places in the arm of an unmoveable rest which can make for some rather comical moves when wanted to change a channel on the TV!
But all in all although Virgin have clearly got wise to the fact that people on long haul flights are prepared to pay a little bit extra (the price has risen significantly in the three years since we started using it) it is a nice luxury to start your holiday off with - better service, no lenghty queues at check in, extra leg room, champagne on take off, and for us most importantly first off the aircraft in the US so customs is usually a breeze as you are first in line!!!!
Not bad after a long haul flight having previously been stuck for 2 hours in a queue just to get through immigration!!!!
I too am however seriously contemplating using first choice as it is cheaper and seems to come highly recommended!