Opinions onTransitions Photochromic Visors

I've got three Shoei helmets which are two Neotec II and a RF-1200. The drop down sun visors on the Neotech are helpful when riding during sunrise and sunset. Unfortunately, the RF-1200 doesn't have a drop down sun visor. Since I don't like wearing sunglasses I am considering a transitions photochromic visor for the RF-1200.

Any thoughts or reviews from users of transition visors. By the way, are they dark enough for direct sunlight during sunrise & sunset?

Thanks,