I've used this mask in various weather (from hot and humid to cool and dry) for hours on end and I've never had it fog up on me once! Every other mask I've used fogs in minutes, but not this one. The field of vision is incredible! I've look at a lot of these other reviews and I can't believe they are describing the same mask.
The only real complaint I have is that the since you have more lens, you have more light reflecting off it. Other players have picked me out of the woods just because of the glare off my mask.
The mask is worth it. The glare may be a minor problem, but being able to see your opponent and before they see you well makes up for it.