Lots of headroom, but LESS legroom than the 738 we took to get to DFW! 10 hours with hitting knees on the seat ahead of you. (I'm a 5' 6" woman, medium sized.)
I'd have loved to upgrade or even fly business, but was using miles, and those Capital One commercials going on about black out days and limited choices are so spot on (I'm seriously considering switching from my useless Advantage card to a Capital One!).
The seats weren't so wide, either, but not as narrow as in the '80s. Definitely NOT for any normal sized human being, though. Very disappointing!!!
Customer service was OK. Meals were one scanty one and one snack. Pasta or chicken choice on the meal. Did serve ice cream on way back, but not going.
Only decent thing was seatback screens, but those were in the domestic flight, too. Had free wifi, but I couldn't get it to work.
It got us there and back, but that's the best I can say about it. (I even paid a little extra for my seats, too!!! -- just for a step up from the free seats.)