I’ve had a few photochromatic sunglasses.

They are much slower to lighten up than darken.

They’re decent and I wear my Wildhorn glasses most days. Good bang for the buck.

With rapidly changing lighting, there’s no glasses that I know of that can keep up. Most I know of change based off UV light, rather than sheer brightness, mine are pretty dark even with moderate sunlight. They’re cool glasses but they really only excel on rides that finish in fading light.

For tunnels and dark spots, you’re probably better off taking your glasses off for a minute. Some fit well in pockets, some in helmet vents. Figure out what works best for your setup.