I have purchased several of these little hard-working trimmers. I put them through a lot of abuse trimming my family's hair with them and they have always performed well despite being sold as just mustache/beard trimmers. I have also used them to trim small animal jobs too - they are just way better quality than you would expect. Even when new they are a tad noisy, that is the only little complaint I have, but for the price you just can't beat them. The best part about these trimmers is the way the comb adjusts. I have yet to find another set with ONE comb that you raise and lower with a roll of a knob. I do NOT want to try to keep up with a bunch of different combs - with this model, you just roll the scroll button with your thumb and the comb goes up and down. So easy, fast, and convenient. The battery life is also excellent. I've never had a battery wear out, it's always the little plastic driver that makes the blade go back and forth that wears out first. In larger commercial sets for livestock, that little drive mechanism is replaceable, but I've never tried to find one for this inexpensive unit. I guess I could but I feel like I get my money's worth out of these clippers. This is my third set. I hope I can continue to get these in the future.