The method used it only as good as the trainer using it.

I will probably sport the highly unpopular opinion in that I do not believe training collars are all bad.

I DO, however, think they are very often misused by owners who are not properly trained in how to use them or who aren't rewarding for the correct/desirable behaviors, hence not getting results.

These are training TOOLS, not training solutions, and many owners seem to confuse the two. They are not meant to be a solution to your problem, but simply an aid to help the training process.