I have the a40 its a nice helmet and ive used it daily for about 6 months maybe abit less, never had any issues with it. I like the material its made from its very flexible not like some other helmets ive had in the past. The true colour is pretty good. I do have a video of me looking through it in light state. There is a vid on YouTube of a chap looking through it aswel il try and get a link if I can find it again.
This is looking through the a40 (sorry but this was the first thing I came across to get a photo) it would be clearer if the lens was new but seriously its clear and its just as clear when welding. Go for the a40 you won't regret it. The grind button on the outside is a big advantage aswel.