a click is just a mark. I really don't think it matters what a person uses in the end. I don't measure my training by the first 2 weeks, but by the end result and they aren't all that different in terms of performance or time.
I like verbal marks, if i am not consistent in the beginning, though I think I am consistent enough the dog can pick it up really freaking quickly, they learn to read me and my voice and all the variables that are going to come up later. So sure, in the very beginning stages, being mechanical and sterile might help, I think any perceived "advantage" is short lived over verbal marks. longer term, I think the verbals offer advantages to me at least, in terms of that variability because they learn that I am variable too and how to read it. Maybe I'm just biased because I haven't figured out how to make a clicker click
I never "charge" anything. They always have to do something for me
I'm a real prick that way. It takes them a little bit to understand, but that's ok, i can't think of any training that doesn't. They look at me, mark....reward. They come to me, mark....reward. Lure to sit, down, to heel, mark....reward.
It doesn't take long before they are learning all the things I want them to. To test if they know it, which is usually just a week or so depending on the particular situation, i get them doing something that allows them to completely ignore me and when I see them off doing something else, not expecting any sort of training to be happening, I mark, and they always spin around and come running so fast to get their reward. I know it's conditioned.