Thats a poor assessment for reliability, even if quite the testament for how you maintain your equipment.I have the same saw. Worked the living snot out of it for days on end during cleanup after 2 tornados came through the area. Trees were mature mixed oak varieties.
I nicknamed it old faithful. Top it up with gas and chain oil. In about 3 cranks, it's running. Won't quit till its out of fuel.
Had 2 Stihl saws, an echo, poulon and a craftsman saw running around me. The craftsman was dead after a couple tanks of gas and wouldn't start the rest of the day. The poulan wouldn't start after the first tank of gas. Both stihls and the echo were dead by noon and wouldn't start the rest of the day.
My 455 started every time. And the only time it got shut off was when it ran out of fuel. Then it got sharpened, topped up with gas and oil, bar sprocket greased and was back at it.
One stihl that was brought along wouldn't start at all. If you choose to go with a stihl, stay away from the easy start models. Pull the cord, release it. Then it cranks over. Everyone I've seen over the years has always been extremely finicky.