389 EUR is a total bargain for a 14 hour flight, for me a total no brainer especially because AF W seat is unbearable to sit in for 14 hours.
Catering in AF W is nearly identical to Y while in J, they serve probably the best J catering of all European carriers.
The offer does not stay until departure so take it now while you can.
EDIT: I see it's KLM J, still worth the price in my opinion but KL W is pretty good.
On the way back in AF W, I would actually prefer to fly in Y, W is unbearable.