Thuja Green Giant

What's the deal with this evergreen tree? As I'm scouring search engines in my quest to find fast-growing conifers suitable for creating screens, I keep coming across the Thuja Green Giants. The growth statistics associated with this tree are mind-blowing, claiming an impressive 5 feet per year according to the US National Arboretum. I already have Norway Spruce on my priority list, but I'm intrigued by this discovery. Has anyone had any practical experience with the Thuja Green Giant?