Luna's mom - I'm sure you're aware but clicker training isn't just about high value food, although certainly often it is. It can be used with anything from toys, to the sleeve, to other behavior the dog finds self-rewarding.
And personally to prevent my dog from running out into the streets, I use a leash. Yes, that's a tool, but I also know that an electric stim from a e-collar won't stop some dogs from chasing prey into the streets, but a leash will.
To each his own.. I have used an e-collar before and I think for the regular person, you don't need training based on aversives to get what you want in a regular, everyday arsenal of easy, normal commands like "sit" "stay" "down" or "heel".
Like in this scenario as described by the original poster. ...I kind of don't understand why the OP chose to use an e-collar on her dog that chased other animals and bit people, instead of using a leash with muzzle, perhaps. It doesn't seem to me that a dog with a bite history would be easily broken of such behavior just simply with electric stim, and if so, if that would actually be right to now call the dog "safe in public" just because it has an e-collar on. I certainly wouldn't feel safe.
(Never mind, I just now read your earlier post and it seems like we are actually agreeing.. 
)
Of course, though, I know of situations where you might use an electric stim.. for example, on a hunting dog that needs to be off leash, or, rattlesnake avoidance training.
And I felt like I had to add: OP said that for an inexperienced owner, the e-collar was a good solution vs a professional trainer. I think this is the furthest from the truth you can get... :S
If a person uses an e-collar, said person should be MORE in tune with a dog and more experienced with different types of training and dog behavior than the average person. You can't mess up a dog with messed up positive reinforcement as badly as you can mess up a dog with messed up e-collar training!!