LOL, i have saw a few that had a vibrate feature and a tone feature but that to me is just more unneccessary bells and whistles. The guy is incredible though, I just wish he would have shared some of his knowledge with me, he was very guarded on hiis techniques.
I know that this is an old thread but thought I would chime in since e-collars are gettong more and more popular with different kinds of trainers. It can be a great training tool and have I used it to train gundogs and it works wonders, but, if you dont know how to use it properly you can do alot of damage to the dog and set back training. I would recommend not using one unless you are familiar in the proper usage. A dog can also get "collar wise" which is basically them knowing when it is on and when it is off, and they wont listen when it is off.