I've been playing with the Tippmann mask that comes with the starter kit. That mask tends to fog pretty easy for me. When I was at the local paintball shop they had some of the 45 dollar masks that had thermal lens and stuff, but I saw the invision for $80 and I called a friend. He sent me here. I read the first page or 2 of reviews, and saw a lot of "Try and Fog this Mask."
Well It didn't take me long to fog it. The first 15 Min's or so was great. It fits great, its comfortable, even bounced a shot. Then it fogged. The whole reason I purchased the mask was to stop the fogging.
Was it worth the 80 bucks for me...No not really. All that was really achieved was something that fits nicer, not clearer.
Try one before you by it. Mine fogged maybe yours wont!