So yeah, I broke down and bought one to test it out. A Gentle Leader that is:

It's a Halter for a dog pretty much. The concept is really good, and all. But I don't like it in functionality. If used properly, on a dog who doesn't pull much or struggle on the leash it could be effective. But Testing it out, talking to professional trainers who swear by them, I still think they are too much of a risk for using to train a dog who isn't a tiny puppy who can get used to it easier, or on an older dog with no previous training.
My Dog Did fine on it, but she already Heels, stays, goes and grabs things out of the fridge for me... you know, the normal obedience training

But if you have a dog who doesn't Heel, sit, stay or listen at all, I would not reccomend a Gentle Leader. If you have a dog who listens to your commands, but jumps up, or barks and wines alot, then yeah, I reccoment a gentle leader. I do not reccomend it for those who aren't working with professional trainers and those who can't control their dogs normally.
And this is why.
If your dog fights and pulls and tries to bolt off when you walk them, DO NOT USE THIS LEAD.
It can break your dog's neck. If you dog sees a squirrel and wants to chase it abrubtly, it will Pull your dogs head to face you, But the body keeps going and SNAP there goes your best friend Fido, to doggy heaven... and nobody wants that.
I hardly think that is humane, and I don't think it should be risked. There are other training collars that are more humane. And even though that Gentle Leader says it's "Natural and Humane" I don't buy it one bit.
Now if you have a calm dog who walks on the leash politely and doesn't pull, then yeah this lead can be good. It DOES simulate an alpha dog mouthing the subordanate dogs' muzzle, which is ingenious, But I think it could be redisigned to be more effective and safer.
Just using this Head Lead for a few days, I can see there are positives, yes, It can end barking, Whining, and begging, But for pulling, and dogs who yank on their leash I do not reccomend it.
I think that the Risk outweighs the reward, and I'm sorry if you don't agree with me, just take a step back and look at it from an unbiased point of view like I did.
Pros:
it can stop Barking.
It Can Stop Whining.
It can Help teach your dog Sit with no treats.
Cons:
If your dog Bolts, it can snap their neck.
Now think about that, is it really worth it?
Now I know i'm not going to change anyone's mind, but what I'm saying is true, just look at the design of the gentle leader, it isn't safe on a dog who yanks and tries to bolt on the leash, WHICH THEY ADVERTISE IT FOR!
I mean if a Horse is tied to a Post with it's halter, and has a twenty foot rope and bolts, it can snap it's neck too... And a horse's neck is much stronger than a dogs... and a dog doesn't need much room to build up the momentum to snap it's neck, it just takes one time and it's over.....
Seriously, think about it!
Thank you for the support!
Josh Duke