Guys,
I get all over-excited every time I hear about training. Sorry about that, because after reflecting, I think BulletcatchR brings up an important point. Being pepper-sprayed is quite an experience. Some people don't tolerate that experience well, even if they know in theory what to expect. This isn't because of who they are, but because the experience is disorienting and wildly outside their prior experience. Adding scenario training on top of that is more complicated than it may sound. You need to add sufficient numbers of experienced safety personnel to ensure no one gets hurt, decontamination personnel to ensure no one leaves the training area while still decontaminated, an experienced trainer holding the bag who has experienced the attacks peppered individuals use, etc. It turns into quite a production to get it done while keeping everyone completely safe.
The scenario training I encouraged is a great idea, but only if you can get it under a trainer who is experienced in the use of pepper spray and scenario training. No one wants to suffer an injury, and no one wants to program incorrect responses. Both of these are risks if the training isn't conducted properly. I don't want to rain on the parade--especially since I think this kind of training is valuable--but doing it safely and appropriately is the top priority.
I would pull out the inert cans, though, and check out the range and spray patterns, so you can see how far they spray, etc., and encourage you to look for an experienced trainer in your area.