Certainteed should stick to insulation and shingles!!!!!(maybe not even shingles)
Hardie is the #1 fiber cement siding manufacturer in the U.S. and that is their specialty. Plain and simple. They stand behind the products they sell 100%. You wouldn't hire a plumber to fix wiring in your house so why buy siding from an insulation/roofing company. Certainteed tried manufacturing replacement windows some years ago and that too was a failure. Buy Hardie you won't regret it!