I understand the appeal of the Taser, but we're running about a 50% failure rate (granted, out of a small number of annual deployments). Some of this is training which I am trying to correct, but much is the nature of the beast. You have no control over what clothing the suspect is wearing or the precise location that probes hit (e.g.: the heavy unzipped jacket or the shirt underneath).
Our OC (originally Bodyguard 5% and now Sabre Red) has been highly effective. It also allows for multiple deployments which is helpful if the suspect doesn't get a full dose or you have multiple offenders. As Chuck suggests, it is highly effective had moving the less motivated mopes away from the action.