i really dislike playing sousa. they definately restrict your marching ability. and because the lower part of the horn rests on your hip, they tend to move around, even if you're marching correctly. the sousas that my high school marching band has are extremely beat up and don't sound very good. also, during rehearsals, where the horn is on your shoulder for as much as an hour at a time, the constant weight aggravates my back and neck. that might have something to do with the fact that in january i broke three vertebrae and cracked my skull ( i was all healed up in a month, no obvious long term effects), but whatever. so those factors might unfairly increase my dislike for the sousaphone, but regardless i enjoy playing the contra much more. sure it might be a little heavier, and you actually have to use your arms to hold it up, but it sounds much better, you can put it down during rehearsals occasionally, and the bass music arranged for dci is much better than mediocre high school tuba parts. i doubt that this post helped at all, but i typed it and its getting posted.