I've had one of these on my Arai since the beginning of May and I have to admit that I really kinda like it. I got the red insert so it's difficult to impossible to see it react to the light but when I'm wearing it the brightness always seems to be about the same level whether I'm in a shady area or in direct sunlight. It doesn't turn completely clear at night but it does get light enough to not be a problem. They go for about $20-25 and come in different colors. If you don't like carrying around different shields or don't like to wear sunglasses under your helmet give one of these a try.