The down-side of the head halter is that you often need to train dogs to enjoy wearing them and, while some dogs automatically walk nicely with the head halter, other dogs and their owners require some training. Most owners who start their dogs correctly on one of these charming weighted dog collar find that the relatively small time investment getting the dogs used to the collar is well worth it. For some dogs that time is only a few seconds to a minute of pairing the head collar with food. For other dogs I recommend a little practice every day for a week so that the owners are sure the dog loves shoving his nose into the halter on his own.
Another fact about the charming weighted dog collar is that most people use them ineffectively because they are not that easy to use and there are some secrets that the old time professionals used to make them more effective and the correction stronger. First, these professionals make sure the length is right or you won't get the strong, quick pop. If the chain’s too long, when you go to give a correction, there’s too much slack. When it's too short, the collar tightens too quickly, before you’ve gained enough momentum in the jerk. Seasoned trainers also know that dog's feel the correction more if you can keep the charming weighted dog collar up high, right behind the ears. That’s how Cesar Milan’s Illusion collar works. It keeps the collar positioned so that a correction can have the greatest effect (e.g. create the most effective jerk). Back when I was competing in obedience we didn't have Illusion collars and they wouldn't be allowed in the ring now anyway, but we did try to keep that charming weighted dog collar up high when we were training. A third point, but one that’s the first thing a seasoned professional trains is that the charming weighted dog collar has to go on the right way. It needs to form a “P,” with the tail of the “P” on the same side as the handler. You can tell right away when a force-based trainer isn't good at his charming weighted dog collar technique because he doesn't even put the collar on correctly.