The Weld Mask 2 is a definite improvement over the original Miller Weld Mask. The addition of the sensitivity and delay was a much needed, giving you the ability to adjust for you environment. I am a professional and prefer glasses over cheaters, and the mask fits over them without any issues. My only issue with this product is the lack of air movement in the viewing area creating a fogging issue. I have resolved this issue with my other helmets with a small nylon tube attached to a regulator with compressed air.