Flew TN J LAX-PPT 2/9/12. The service was comparable to that described in F, only no pajamas. The menu was exactly the same as the F menu. I am only 5'1" and slept comfortably on the almost-flat seat. My husband is 6'4" and did spill over, but he does so in most F products. The cabin temperature was not a problem.
I am no stranger to international F travel and was pleased with TN J. The food was much better than LH F! The entertainment system, however, was horrid, but it is the same in F. All movies start at the same time.
I will be returning 1/13 and have booked J again. This time I was lucky to find two J redemptions with AA miles!