The silvering on the current one is failing, caused I think by the same thing that caused the seat belt warnings I had.
A blocked drain (elephants trunk) allowed water to enter via the pollen filter housing, I didn't notice it until a heavy storm left 3 inches of water in the passenger footwell. It's amazing how much water you can get in before you notice it when it's parked facing uphill lol.
I don't have auto dimming so might consider the upgrade.
Thanks Alan