Well... Virtual reality can't damage reality so I'm guess it is accurate to say it is virtually unbreakable...
Most likely they mean through normal use it will only break in very rare circumstances and should survive falls, spills, hits, drops, kicks, use and the like in well functioning (not leaking) condition.
Dropping it from the top of the Empire States Building... Well thats way beyond normal use...
***************************************
Have a problem with my spelling or grammar? Please refer all complaints to my English teacher:
Ralphy "Me fail English? That's unpossible." Wiggum