I don't see the use in using miles or money for AF Premium Economy product. It is bareable for a daytime flight and there is more space width wise, but then the food is economy level and sleeping in these seats is extremely uncomfortable. I prefer a normal economy seat. If I'd get a OpUp from Y to W on a red eye flight, i would refuse and keep the Y seat unless i had a middle Y seat.
It's just too bad because the products looks very good, the lousy ergonomics of the seat ruin it totally. OK and the cheap champagne as well.