This was my first goggle system and its going to be my last until I loose it. When I took it out of the box it came in the first thing I did was walk outside where it was 40 degrees and breath directly onto the lens- no fog. Then I put it on- hella comfortable, and it barely obstructs periferal vision at all. The flex-7 mask doesn't always work, but I've had a couple of balls bounce off.
the only thing I can think of is that it looks stupid. I have the black one which is great for stealth, but it for some reason flares out at the sides, giving a rather silly look. I think mine may have gotten slightly misshapen in the mail, because I don't see the same effect on pictures of the mask or on my friends who have the same system.
very good goggle system and well worth the price (I paid 40 for it). I would never buy any other mask unless I just had money to burn and wanted to look really cool.. then I would buy the proteus. This is one of the better investments I've made- don't start with a crap goggle and upgrade- its no fun and you'll spend more money that way. get this one to start with.