Beefy and BA
Wearing glasses under a goggle and want to them fog free? This baby comes at a price but certainly does the trick! The fan is so quiet you can't hear it to turn on or off while skiing - really - it's that quiet. Comfortable all day over my glasses. Good field of view and a smorgasbord of additional lenses are available.
I might be a bit challenged but changing lenses took me some time the first time I tried though becomes easier with practice.
The IOX comes with two lenses which is nice. But IMO for the $ one of them should be polarized or photocrhromic.
I tried one of the less expensive Smith fan models to compare (Smith Knowledge OTG) and the IOX is by far superior OTG fan goggle.
4 stars for great gear at a high cost. Get it on sale and you've got a killer deal.
Oh yeah, and I'm not a Smith Rep (see review below).