We were able to book a flight on a new Boeing 787 with the individual 'pods' in 1st Class. Extremely comfortable. The service on this flight was also first class - the well-trained flight crew was very helpful and courteous. We requested a wheel chair through our connecting Delta flight, and while Delta couldn't guarantee that one would be available, the Aeromexico staff assured us that a chair would be at the deplaning ramp, and indeed it was.
Unfortunately, the return flight on a Boeing 737 was not nearly as accomodating. We waited 2 hours for a wheelchair at the check-in desk, we were not offered any pre-flight beverages in our Business Class seats, the steward disappeared for the 3 hours after the early meal was served, and the landing was especially bumpy. So, I suppose timing is everything.