I just got 3 GLs in the mail this past week. Carter fought it for about a minute, then just accepted it and walks like a gem! It took a little learning but he didn't fight it except for a few times pawing at it. I think with him the pulling was just a habit, he'd never been taught otherwise. When you start to learn and are already HUGE, it is harder for the "mom" to gain the upper hand. I haven't tried it on Katie yet. She only pulls when she sees something exciting so I'm not sure I need to do it. I think I'll wait a bit until Carter is completely under control for a while (he still gets to increasing his speed walking and needs to be drawn back) and see if she doesn't continue to improve. She's improved so much already in the weeks we've had her.
Then there is Eider. You expect a Pyr to be hard headed. You expect a Lab to be soft and willing to please. Eider is generally pretty responsive to me and almost always listens the first time I tell him but this GL thing is WILD. He fights, rolls, rubs, pulls, you name it! It is absolutely incredible. I've never seen a dog so adamant about not submitting to it. He was more trouble alone on the GL than Katie and Carter were together when Carter was learning what it meant. I tried to walk him once on it but ended up stopping the lesson once he submitted and acted polite for all of a half a minute, then tried it again for a short session the next day. Put it on and go until he cools off and walks nicely for a minute and then take it off so we can end on a happy note. Every time it goes on though, the fight begins!