I've been cutting about 8 or 9 cords a year, for the past 18 years, to feed my Bryan furnace every Winter. I haven't tried any 8ten chains, but I've tried Stihl, Oregon, Forester, and probably a couple of other brand chains and bars, over the years. I've had much better results with the Stihl chains and bars. I have a Stihl 044 and a MS271, and the bars on both are still good after 2 years of cutting. I clean the saws and bars after each use, and sharpen the chains, and get dozens of hours cutting off of each chain before I have to replace it. We have a local ACE Hardware that sells Stihl chains for little more than prices on Amazon or EBAY.
The question I would have is....where are 8ten chains made? I looked on the Internet, and found nothing....I suspect they are a China Import.