I don,t use mine any where close to the amount you use the Stihl.If I used it a lot I would buy a Stihl.We have a Stihl MSA 220C at work that is great quality and cuts almost like a gas saw. Works great for small-medium jobs, and my arborists love it for using up in the bucket truck. And, it's proven Stihl quality and service at about the same price as that off-brand one.
They've all come a long ways in the last three or four years. I don't think they will ever replace gas powered equipment for major/heavy stuff, but they're quite practical for most jobs now.I have the Ego chainsaw, along with a blower and weedeater. I'm not going back to gas.