I researched different roofing systems and found this one to be best and also the most expensive. Steel rusts after time, and exposed screws or fasteners will eventually leak. The aluminum nails used are hidden, and the aluminum roofing panel is light weight, won't rust, and doesn't retain heat like an ashphalt shingle. They also use a superior underlayment, than most roofers. The water barrier works even without a shingle on top.
Whyman and his crew started on the main roof in Nov/Dec of 2018. When they were removing the old roof, a worker threw a shingle down my brand new window scratching it. Whyman covered the cost to replace the glass. The main roof was completed in the spring of 2019.
The second, lower roof over the garage and porch was delayed at my request so I could change the gutters, soffit, and fascia. ( see Novak review) The gutter installer would require nailing into the garage roof to support his ladder. The gutter job was done in a week, in the spring of 2019, and I called Whyman and his crew back to finish the job. I got delays and excuses and had to call the office to complain, to have him come out. He tried to fit me in whenever he could between jobs, and I had to constantly call him. The job was finally finished on June 30th 2020.
I love the way my roof looks (like real slate), and my A/C costs are way down since I've had the roof. Neighbors have complimented the roof, and I believe it will last as long as the house does.
However, I would not recommend this roof unless you plan on staying in your house a long, long time, to recoup the price of the roof. With housing prices through the roof (pun intended), I plan on passing on the house to my kids. So the cost of the roof is worth it for me and my kids. The installation was a headache, due to the constant delays and phone calls required. Also, the price doesn't make sense for the majority of home owners.