I have season tix to the Flyers and my seats are behind the net, I love it because you can see the play unfold as it moves up or down the ice. A friend of mine has seats for the Eagles in the end zone, I love sitting there because like hockey, you see the lanes open up and the back shoots through the holes...sitting on the side of the field, especially down low is usually tough to see the running plays form...
the only bad thing about end zone seats is if a team is in the red zone and knocking on the door for a touchdown and the quarter ends, the pack up and move to the other end of the field and you usually watch the next few plays on the big screen...but its great if the scoring team is coming into the endzone you are sitting in....personally I love sitting in endzones or behind the net, plate, basket!!