As usual there are many camps, they work, they don't work, those that have tried them and people who have not. I have a Bell Star Carbon with transition shield and an AGV with a drop down dark visor inside. The transition shield works well day or night, the only slight problem is when you are going into shade and back out quickly, the lens takes maybe 20 seconds to adapt. The drop down is a good compromise in that you can drop it whenever you need it for as long as you need it. Either way I don't have to wear sun glasses or carry an extra shield.
Cheers
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