I have heard nothing but good things about Stihl chainsaws. I have never used on myself though, so I can't really recommend it from personal experience.
I can tell you that I did landscaping for about four years, and got some experience using different chainsaws. If you are looking for a smaller saw, for trimming mostly or cutting smaller trees, I am able to make a great recommendation. When I was cutting trees my main climbing saw was an Echo CS-300 or CS-340, both are top handle saws. I had no problems with these saws, and they were just abused and abused. I can remember running one under water, in mud, and dropping it out of a tree. Still ran without trouble, in fact when I dropped it about 20 feet out of the tree it didn't stop running.
The owner of the company was not really one for mainting his tools properly. So these saws were run with dull chains, and forced to cut wood way to large for it. Still no problems with the saw. What eventually did happen probably after 1000 hours of use and ABUSE is the bar cover on one saw melted. That meant that we had to get the clutch so over heated it could just melt through 1/4" plastic quickly. After putting on a new cover the saw ran good as new. I can't recommend this saw enough, for private use it should last a lifetime.