I have two sthil saws my small one is a ms362 with a 20 I ch bar, also have a 25 inch bar for it, and my larger saw is a ms461 with a 28 inch bar love both of them. The pro saws are the way to go.
I did do some research and there are a couple other company's that carry a similar product, I believe that the other company is eco foil. I did see several instances where there were unsatisfied customers, but I'm sure one could research and find something bad about every company out there...
I just built a new pole barn. and am using Prodex 48 it is sold by insulation for less online, it a thermal and vapor barrier in. It has foil on both sides with stapling tabs