I'm not a fan of auto-dimming rear view mirrors. I don't mind the bright light, and like the truer colours. Ultra rarely would I ever flip on my manual mirror.
In the Ram it auto dims and you can press it to turn off, but per ignition cycle. So I usually find myself turning it off every time I drive at night at some point if it's a long enough trip. The truck has tinted windows and with it on I can still see out fine, just don't prefer it.