I have been an Amsoil dealer for many years and I will not run anything but synthetic in anything (chainsaws, generators, big vehicles-ANYTHING). I have used the Amsoil at 100:1 and it runs perfectly fine. You will not burn up a saw because of the oil. The saw will outlast everything else if you run synthetic. I have an 11-year-old Husky that hardly even has any carbon in the muffler. The spark arrestor screen had never been removed until about a week ago and it was totally clean. I am currently running 50:1 in my saws just because I choose to. I ran nothing but 100:1 for a long time without any problems. You will not foul any plugs and there is very little smoke at whatever mix you choose to run. If you don't trust it, that is fine, but I prefer to have my equipment last longer. You will notice an immediate difference in the way the saw runs if you use the Amsoil. The Saber is the preferred oil for chainsaws. There used to be only two options-injector or premix 100:1. They have refined that a little and now it is more use specific. My brand new 361 screams on it.
An old friend of mine and Amsoil distributor knew a guy that ran a premix dirtbike at 125:1 for an entire racing season before he broke the motor down to find that everything was still in good shape. There are thousands of stories like this.
Amsoil is exactly what it says it is. If you want to use the cheap stuff and pay later, that is your prerrogative, but I don't do that. Go to their website and do some reading if you want to learn more-amsoil.com.