Well, since I see this weapon as a self defense weapon good to use for private citizens, and for these purposes they should suffice.

Otherwise the use of pepper spray is effective in close encounters.

this might be interresting:
”One of the biggest misconceptions about defense spray is that the higher the percentage, the hotter and better it works. In most cases this could not be further from the truth. Most of the best, fastest incapacitating sprays in the world are from 2%-10%. The lighter the fluid, the faster is penetrates the membranes. The percentage has nothing to do with the actual SHU or ”hot” in the spray. Also, thicker sprays can inflame the skin area more and last longer with this unnecessary inflammation. A good spray will put
the attacker down and out allowing you to escape or take control of the situation.”