We recently purchased the Sport Dog shock collar. Me being the reluctant female(thinking..."ohhhh...how cruel", and my husband being ever so reassuring that it really would be beneficial, AND he would test it on himself(be he ever so manly...I had to see that one!)... We bought it for the sole intent of gaining immediate and definitive control of our then 7 month old/70lb doberman pup, since we have two children roughly the same size as the dog with the dog soon to surpass them in size. Setting 1 did absolutely nothing, setting 2...well, dog ran around confused after the correction. Setting 3 definitely got his full attention. I was a believer after using this the first couple of times that it is VERY VERY effective in a good way. The best part is the warning tone... you give the corrective command, and when dog does not respond, you beep then immediately give the corrective shock(what really amounts to a strong static shock from walking across the carpet and touching another human...even tried it on myself...and I'm a GIRL!)... The positive thing about the warning tone is that after just a couple of shocks after the tone...ALL YOU HAVE TO DO IS beep...dog magically responds, and does as he should. Great for a bark collar as well. When my overzealous barker goes nutzo in the backyard just because he wants to hear himself bark...I give the tone from in the house...he STOPS barking, and will quietly go about his routine outside time only to bark at the really emminent threats(well...that he perceives when the cat walks on the fence!). Batteries last okay... we really just got lazy about turning the unit off EVERY time, so they did run down within a couple of weeks of use, but not that expensive to buy a couple more at the local market. The ONLY CON is that when the collar is not on the dog, he KNOWS it, and pushes his luck a bit more. I have heard tale of other collars having a dummy collar for just such cases, so I am considering making up a dummy for him to maybe trick him into thinking it's always on until he is a grown up doggie, and will be all knowing in the ways of human expectation of less barking, no jumping on the glass door, no sniffing the no-no area on guest or pack members, and come to my side when I say... On that last note: that was the BEST part when my lunatic came immediately to my side after saying "Come", tone, zap! Pretty soon, "Come", tone".... now just "Come", and voila', he's there! LOVE IT LOVE IT LOVE IT.