Please note that this review is for the IUT-302 ultrasmart remote trainer for 2 dogs. This is the system that comes with a remote control and two collars - it is not a containment system or a bark control system. This is the system to help train your dog.
This system does what I hoped it would do for me and my two dogs. I like the +2 feature, and the tone only option. I also like that it's the collar the emits the tone, not the remote. This way if I want to give one of my dogs a positive tone, although the other is still misbehaving they won't both get the positive reinforcement - only the dog I intend to. The +2 option is useful for those times when my dogs are being REALLY stubborn, particularly at the off-leash dog park. I find that it helps me get my dogs' attention, and that is really what it is meant to do. It doesn't hurt them, but it does surprise them out of their stubborn moods they get in. I have tried the collars on my arm at the levels I use on the dogs and it doesn't hurt. It surprises me, even though I'm expecting it (I'm giving myself the correction) and that is what it is meant to do. It just gets their attention. I can get their attention much easier than with a collar and leash alone, especially if they are off leash. If they are off leash, and in their own little worlds, sometimes I think a bomb could go off and they wouldn't ever notice, let alone hear me and my commands. But this helps me get their attention back so I don't have to go off chasing two dogs all over a park who really don't want to load back up into the car to go home.
My only complaint is that every once in a while when I go to use it the remote won't come on. I have tried re-seating the battery, shaking it a little, tightening the door, pushing buttons, holding it close to the collars, and even putting a new battery in. Hours or days later though when I go to use it again - voila! It'll work just fine without a hitch. The system is easy to use, easy to set up, and has a lot of good training information with it. Their website also has a good training video to use with the collars.