Booked a couple of Paris-Lisbon flights for private weekends next year, all JOON.
It actually *is* an improvement: whilst prices are the same as before (so no disadvantage from passing to JOON), the FA outfit is obviously ridiculous (who cares, not a reason to fly with them or not to fly with them), catering is now BOB in Eco (so what, I can pay 10 EUR during the flight or on the ground or eat in the lounge, I never took the AF onboard sandwiches in Y anyway) there is one marked improvement: all flights are now on JOON A320 with comfortable seats, instead of some flights operated by A318 with their terribly uncomfortable seats! So for me that works. Re-fitting the A318s with proper seats would have been the better option, but given the choice between a JOON A320 with the new seats and an Air France A318 with the NEO seats I clearly prefer the new seats.