Pew pew go the documents!
On the surface, this seems like a fairly niche, overpriced novelty item. But loaded up on the stick are digital copies of the Mega Man #1-4 comic books, Mega Man Tribute Art Book, Mega Man X Complete Works, Street Fighter X Mega Man soundtrack, SFxMM wallpapers, and a link to the SFxMM game.
Truth be told, a digital copy of Mega Man Tribute and Mega Man X Complete Works are the real steals here. I highly recommend both, and since MXX Complete Works is really hard to find, you may want to pick it up this way.
Mega Man USB buster [Capcom Unity]