I wanted a dark smoke visor for the Tekker helmet I've been using for summer riding. I'm very pleased. The dark smoke has turned out to be exactly what I needed to cut down the temp in my helmet on those bright sunny days. It also seals well against rain and wind. Have had no trouble keeping the visor partially open to relieve fogging.
As far as features are concerned, it would be nice if each Trekker visor came with its own ratchet system pieces to make it easier to switch visors with less difficulty.