Bought a couple of these for my gf. They're crazy strong (5.3million scoffield), have good distance, and are used by local LE here.
As of a couple yrs ago it was the strongest product on the market.
It comes in a spray or cone, liquid or foam, and you can also buy ones with dye in them that will stain the perp's skin blue or green for a few days, makes it real easy to pick the guy out. You can get em at gun shops for like $20.
When I worked in nightclubs, if the crowd got out of control they would spray this in the air for a few seconds n clear a club with 1500 ppl out in a matter of seconds. Stuff was incredibly strong.