oc is good for some people. However there is a percentage of the population that it has no effect on. I am a Corrections officer and I sprayed a guy once and he shook it off like it was nothing. It bought time for back up though
You never know what that gun may or may not do. In the instance you draw down when needed and it goes click you may have just killed yourself. Always know your equipment.
IMHO glock is the way to go all the time. I own several and love them, I have owned the mp and it is ok. Smith is always trying to live up to the glock, remember the sigma. No need to say much more