I'll start by saying that after today I really feel as though I got my monies worth buying this saw. The MS-261 CM is the entry level professional grade chainsaw from Stihl. C stands for commerial, M for microprocessor controlled. I have to admit that my knowledge of chainsaws and the operation of them is lacking. I spent a fair amount of time researching on the internet as well as talking to helpful salespeople who were willing to spend the time to explain the differences between the commercial saw and the home/farm saw. The gist of it is that the the MS-261 CM is manufactured in a way that is designed to be rebuildable and robust. It has addition vibration dampening, steel chain guides, beefier clutch assembly. It also has a microprocessor that is constantly adjusting the carburetor to the situation at hand. So no carb adjustments is nice. I'm badly out of shape, drogers and I did about 2 solid hours of cutting with our saws today and by the end of it I was near to puking. I'm not very impressed with myself. Every time I had to pickup drogers saw and move it from one spot to another I noticed how much heavier it is than my Stihl. He has a nice Husqvarna that has a bit more power than my saw but also is ~2 lbs heavier. When I was in my shit kicked state, those two lbs made a huge difference between being able to still use the saw to finish the remaining cuts and barely being able to carry it around. The following is just generalization of my experience with the saw and not specific to today's operation: I can't say I'm too happy with myself though. I'm making some mistake in operating the saw and somehow I'm flooding it or getting vapor lock with it after getting it hot. I've also managed to ruin the original chain that came with the saw in what I would call a freak derailing. Totally unexpected but the round fell in a way that it pinched the chain as I just went slack throttle and it derailed and wrapped up on the chain catcher. The inside of the chain was just mangled up enough I couldn't use the chain again. ~2hours on that chain. I put my spare chain on and with less than 15 minutes on it I clipped some pavement chopping up rounds and dulled the chain completely. Took 20 strokes with the file and guide to get a good profile back. I'd estimate 10% of the chains life removed. So I do need to get some more spare parts for it. A couple chain catchers, two spare chains a spare bar and two spare spark plugs. Oh and experience. I need lots more experience.