I have the airbrakes, used them 4 times this season with all kinds of different conditions. I have not had any fogging problems with them. They are a little on the large side but they still fit great with my smith maze helmet. I haven't tried the smith i/o's so I can't comment on them. Would be nice with the airbrakes if you could pick the 2 lenses you get but that's not the case.
i went in store and picked out the 2 lenses i wanted.