It works well on cutting back on barking. It also works well for obedience training with the shocking feature. I haven't read the book as it is rather thick to learn all the functions but it is pretty easy to figure out. It is a lil bulky I have a 1 year old boxer right now and it's kinda awkward for him right now especially when he is in his collar and not his harness.
I would recommend this to a friend