I know a guy who's got one. He says it's cool and all, but due to the rarity of the paint and being banned from most fields, he's looking into getting a "real marker", as he put it. I watched him chrono that thing once, and it's gotta be at about 400 fps to operate correctly. I've never been shot with it, but supposedly since the ball is smaller, it imparts the same force as a 68 caliber at 280 fps.