im still having a hard time grasping how note taking on a computer is ever more efficient than listening and taking notes in class. not only can you not free hand or put notes anywhere on the page, other students have to put up with the very annoying typing sounds. no offense but i seriously get pissed at those who distract my concentration with their typing. the only compter i can see being useful for notes is the kind with the pen you write on a screen. as for presentations, i just always have a usb drive (that contains the files im working on for a particular week or so) as every teacher is able to get access to a computer for presentation purposes and in my case I am able to access labs to manipulate the files there
as far as showing off, i believe students who bring computers to class that arent programming related or what not are showing off since you really don't need them for class and i could not imagine anyone saying that they do especially in hs.
i think (based off my obsevations in many classrooms) the majority of people need a computer but only to supplement their class work as in program useage, presentations, and the like
heck, even in my programming class, not many people brought computers
sooo in summary since i believe it's not needed, if it gets stolen/damaged you pretty much asked for it