Was very excited to use this because the regular clippers scare me. So, I always take our puppy to the groomers for toenail clippings. I just wasn't sure if our puppy would be okay with these. But the grinder is very quite, so it didn't scare him. Having the guards for the different sized dogs gave us the confidence we needed to actually trim his nails. The slow grinding didn't startle him, like the regular clippers usually do. There were no accidents. We were able to trim to the right length with no snarls, whimpers, jerks or tears. ( And the puppy did great too:). It only took us about 5 minutes to complete all the nails. This nail trimmer is awesome and much more reasonably priced than most on the market. Instructions are inside the box and pretty easy to follow. Once you get through the set-up, you're good to go. I really like this. I don't have to hear tapping toenails on the floor in between grooming's. I can actually skip a grooming and not have any toenail issues.