I've done this flight in WT+ quite a few times over the last year and I really like it - the early start in NY means I am usually nice and tired by the time I get home so I get no jet lag. I usually get awful jet lag on west-east flights, this one is much better. On turbulence it has always been smoother than some night crossings, but that may just be luck.
Not wishing to hijack the thread too much but I am doing this in CW next month - what is the service like - a hot breakfast then afternoon tea or something?