Nope, not for me. Shock collars work by causing discomfort, is the long and short of it - otherwise the correction would not reduce the 'bad' behavior. I, personally, don't want a relationship with my dog where I'm causing them deliberate discomfort on a regular basis. I feel this way about physical corrections in general; I've found it much more straightforward and effective to teach my dogs what I want them to do rather than punishing them when they do something I don't want.
They're also unforgiving tools. If you have poor timing or are inexperienced, or even if your dog is just particularly sensitive, it's too easy to attach negative emotional states to the wrong stimulus. Say your dog sees another dog, gets excited, and pulls. You correct for the pulling, but in the dog's mind, they now think other dogs cause the discomfort. Next time they react more strongly, pulling and barking to get the other dog to go away so the uncomfortable thing doesn't happen again. It unfortunately happens a lot with poorly applied corrective training measures.
I do believe that there are people out there who can and do use them in a humane and effective fashion. I'm not going to come here and claim that anyone who uses one is abusive or evil or anything silly like that. But the risk/benefit tradeoff for me just isn't worth it. I have limited experience, but I've yet to come across a situation with my dogs where I've felt a physical correction was more appropriate or effective than a less invasive training technique. One of those choices everyone has to make for themselves, I suppose.
Well, let me amend that. There are a very few situations I'd consider using one, but they're literally life or death. Think training snake avoidance when you live in an area with venomous snakes coming onto your property, or training a hunting dog to leave livestock alone when an indiscretion could get them shot by a farmer. Like I said, I haven't had to make that choice for my dogs yet, but that's where I'd consider it.