Things I really like about this product are how much you can customize everything and how affordable it is compared to competing products. I was using Sport Dog which was fine but limited in customization. This system can be customized to whatever sensation you need (sound, vibration, shock). The price was about a third of the Sport Dog system it replaced. I really like how I can see the battery level for the transmitter and collars on the transmitter screen. Please do follow the instructions on setting the shock level which goes from 1-99. I set mine at 4 for my dogs (Brittanys so they're smaller) and that seems to be plenty. Speaking of that, the instructions are easy to follow and aimed very much at making sure you use it appropriately with your dog.Minor complaints: I bought the two dog model but only got one charger to charge the collar and transmitter. I can live with that. Switching between dogs requires a step more than you’d want in a hurry but it's seldom that both of my dogs need corrections at the same time so I can live with that as well. I doubt that I'll ever need to shock my dogs because the vibration mode is pretty robust, but someone with a new dog may need that. Would definitely recommend.