One of my dogs is scared of traditional nail trimmers, so I decided to give these a try. The experience was much, MUCH better than usual! They were easy to charge, not noisy enough to scare her, and they ground the tips of her nails quickly and easily. The different-sized openings at the top came in handy as well, as we were able to use them on our large dog (70 pounds) and our small one (about 20 pounds). These are going to get a lot of use in our household.