Stihl...only Stihl. Typical parts that always need updating...chains and bars. Luckily, I have an independent dealer who always gives me good deals, and he's only 6 miles away. In my previous life, I worked for an urban forestry department...climbed trees with saws to trim or cut them down. You learn to care for your saws because sometimes your life depends on their performance.
There's a couple of trees in my grove that are telling me I need to upgrade to a bigger model. Hopefully Santa will come through on that. My oldest son works as a wildland firefighter for the USFS. He visited us awhile ago and helped with some tree work. He told me that my saw would work great for "whittling". I think he meant I needed something bigger, too. Funny how that same son thought my BK9 was "too big a knife", but there doesn't seem to be "too big a saw".
Actually, my grandfather had a two-man chainsaw...that was too big a saw...