I looked at this for work, great idea in an outside space to disperce crowds etc.
Not so good in a closed cell/room.
You still have to go in and get "close" and hands on, Which means you are going to get a gob full as well.
Good for riot control, not so good for close in work.
Should be great for tournys though, just add a few into your hopper, and hit the coke can.!!!!!