the TSX is not as big at the backseat as north american '03 accord
Most reviewers mention that the TSX "seats 4 adults comfortably" and it's "cozy" for 3 people at the back.
I still find it fine. You get a lot of bang for the bucks, except a tiny sacrifice of space at the back .....and somewhat at the front. We shouldn't forget that its not a family sedan. .... more of a sporty "family" sedan.