>It also depends in what situations you need to use one in.
That's very true, it depends on the dog, the situation, what type of behavior you are trying to modify and how ingrained that behavior is.
I support their use in SOME situations and with SOME dogs. I actually have one in the cupboard, haven't used it for a few years now but sometimes it goes out on loan.
I have used it on dogs in the early days of behavior modification as an interruption or a diversion, giving the opportunity to train and reward an alternative behavior. But only short use for a limited period only and as part of a wider modification programme.
It's not used as an aversive but as an interruption and must be coupled with positive training methods to be fully effective.