I've been clipper cutting my own hair for over 15 years now, and I used these Oster Classic 76 for over two years. I really like the Classic 76 and highly recommend it. It has a lot of power and cuts hair easily, and it's an outstanding clipper. The detachable metal blades are much more comfortable to me than the plastic guides that you can buy, too. However...it's not perfect. It runs a bit hot and can be loud, and it's not a small set of clippers. The newer A6 (marketed for pet grooming, but great for human hair) is slimmer, quieter, and cooler running. There are already many, many review for the Classic 76. Like I said already, it's a great set of clippers. I'd just like to give you some info about the A6 to maybe help you choose between them. After getting the A6, I stopped using the 76. Some things that stood out to me after getting the A6 and comparing it to the Classic 76: (*) The A6 is a more rounded shape, but it's not that much smaller than the Classic 76. Holding them felt about the same to me, with the A6 being just a little easier (*) The cord on the A6 is nice and long, but Oster added a transformer box that hangs about a foot away from the outlet. That box will be well out of the way if you use this professionally, though (*) The A6 has three speeds versus one speed on my 76 (*) The A6 is quieter on low and medium speeds, but it's about the same as the 76 on high speed. It is a lower pitch, though, which I happen to prefer. It's a bit less abrasive to me (*) The A6 does not vent air out the sides - which is excellent! The 76 cools the motor by flowing air from the base to two vents on the sides, and the warm air blows on me (or your clients) while clipping (*) The A6 does run cooler on the handle. After using it for a good 20 minutes, the handle wasn't even warm. The blade sure was, but that's no different than my experience with the 76 (and why I bought some of Oster's cooling spray) (*) The A6 requires you to depress a button before the blade will swing out - that's nice. I've never had a blade swing out accidentally on my 76, but I can imagine a clipper getting bumped during professional use, so the added locking mechanism is a nice addition (*) The A6 seems to vibrate a bit more in my hand than the 76, but I think it's that it vibrates at a different frequency (similar to the sound). It's definitely not so bad that I don't want to use it, but it is noticeable (*) The A6 doesn't require (or really allow) you to periodically replace grease. As a non-professional user, I like that. The 76 might hold up better over a long period of time because you can do maintenance on it, but I like the thought of not having to put in new grease - and I have on mine, even just using it every other week or so on myself The A6 doesn't seem to cut any better or worse than the Classic 76, but the cooler handle and the (to me) more enjoyable noise level give it the edge. I think both models are great clippers. To me, the lower pitch noise, cooler running handle, added button for blade release, and no need to grease it put the A6 a bit ahead of the Classic 76 to me - but not so far that I'd highly recommend one model over the other. Honestly, I don't think that you'd go wrong with either model.