Just one problem: It doesn't work. In flight tests, the visor's "symbology" has evidently been unreadable, because the plane itself has been bouncing up and down in the air more than expected. The effect is probably like trying to read an e-book while riding a bicycle along a boulder-strewn path.
"Display jitter," the GAO report says in a footnote, "is the undesired shaking of display, making symbology unreadable ... [due to] worse than expected vibrations, known as aircraft buffet."
Unfortunately for the plane's designers, jitter and buffeting are only part of the problems undermining the visor's use. The others are a persistent delay in displaying key sensor data - making the visor symbols outdated as the aircraft streaks through the air at speeds up to 3000kmh - and an inability to show night vision readings properly.
So what's the big deal? It's just a visor. Well, the GAO report says "these shortfalls may lead to a helmet unable to fully meet warfighter requirements - unsuitable for flight tasks and weapons delivery, as well as creating an unmanageable pilot workload, and may place limitations on the [F-35's] operational environment."