I've used Punch II, Def-Tech First Defense, ASP KeyDefender and Mace Pepper Foam.
The Pepper Foam is good for certain specific applications: it carries better into a headwind and it doesn't form a cloud of OC vapour--which makes it the best alternative for certain enviroments where breathing difficulties must be considered. Hospitals, day-cares, nursing homes, and such.
It is also far easier to miss with Pepper Foam and it requires holding 'on target' much longer to get the same coverage as a burst of spray. Plus, the available amount of OC per can is usually about half for foam as it is for the liquid.
I prefer a 'burst' or 'spray' effect, myself.
LawDog
[This message has been edited by LawDog (edited August 21, 2000).]
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