Hi there. I just started ecollar per my trainer's suggestion. Watching Michael Ellis videos on ecollar (3 part series online) and also reviewing the recall video by Michael Ellis where there's a brief section on ecollar helped me. You can do a search for it or let me know if you want me to look up the links.
I use mine everyday on our walks. My dog's feelings are not hurt because of it. She is still her happy-bouncy-walking-with-a-song-in-her-heart self on the walks and gets that the ecollar stims are just a signal for her to do something and better do it because I will follow up even at a distance. It also helped me tremendously with timing issues when working long distance. Today during our off leash walk, after reinforcing her long distance behaviors multiple times (mainly "leave it" and don't-you-dare-go-chase-that-invisible-thing) with ecollar I got the best ever "front" where it was fast and furious with a very tight finish. I didn't stim her to get the front, but just saying, she wasn't depressed by the ecollar and can be amped up for training still. If used right, the dog won't see it as a torture tool, just as an extension of your magical control over the dog. =)
I will say, the first introduction to my dog where I used the pager, it depressed her for hours. She refused treats the first time ever in her life. After that, she went back to normal and turns out to have quite a bit of tolerance for the stims.