I've only worked with the ones we had a the vet clinic where I used to work. My impression is they are a good quality clipper that are easy to work-on/repair. But, there are others that run faster and are better for clipping calves in my opinion (Andis). Unless the newer A5's have changed, I'd look for some Andis. I eventually talked my boss into buying a couple of sets of refurbed Andis Super 2 Speeds and everyone in the clinic liked them better than the Oster.