I like it a lot, but I wish it had some kind of configuration where the top part of the collar (high on the neck part) was either a dominant dog collar or a prong... when you have a huge strong dog especially with prey or dominance issues you really need something where you aren't having to pit your own strength against theirs.
Just last night I was on my way home with the dog after our walk and we stopped at a grassy area right near my house for him to take a final piss on "his" bush when we suddenly heard this terrible screeching sound, and a second later two cats that were fighting with each other burst out from under a nearby pine tree. They were completely oblivious of me and my dog being there and fought in a hairy cat ball right at our feet. Both me and the dog nearly jumped right out of our skins with fright... it happened SO fast! Suddenly, the cats realized we were there, burst apart and dashed off in two different directions. The dog recovered himself instantly and lunged after one of the cats. Unfortunately, we had been standing right next to a drainage ditch, and if it wasn't for his prong collar there's no way on earth I could have held him back and would have landed head first in that ditch with my arm dislocated.
Now, that's a rather strange incident, but since I walk him late at night we often do come across various critters that come flying out of nowhere or that damn husky that runs around loose all the time terrorizing everyone. Without the prong collar I wouldn't be able to hang onto him. If I get a chance to see something coming I can stop him (actually, unless it's right smack in front of us he just stands and stares with interest which is often how I know something is there before I see it), but when an animal just bursts out practically on top of us I just can't react faster than he does. It's rather amazing how stupid the night time animals are since it often happens that they come flying out of nowhere practically right on top of us when there's no way they couldn't have known we were there especially since I'm always yammering away to the dog on our walks (deep discussions we have solving all the world's problems and discovering all the mysteries of the universe. LOL!). When we walk in the grassy area along the edge of the gully I always have to make sure to make sufficient noise to wake up any sleeping bunnies so we don't step on them (they like to sleep in that grassy area - dozens of them). A few times I've almost put my foot down right on a sleeping bunny. Stupid animals. They're either sleeping right at our feet or running right into our feet.