Marcwrote a review of Smith I/O Interchangeable Goggle on January 23, 2016
Familiarity: I've put it through the wringer
About 8 years ago I picked up a pair of I/Os when they first came out and they were game changers then. Crazy fog resistance. Very comfortable. Easy to swap lenses. And durable. Finally after many years with lots of hard skiing, the foam ripped on top, and I had to get new ones.
I tried the I/O7 as it was a new revamped version, but didn't like them. The lens was bigger so it pushed my helmet up, but the inside of the frame is the same size as the I/O so there isn't any noticeable increase in field of view. I went back to the original I/O and couldn't be happier. This design is still the best you can buy. The lenses resist fogging and clear any moisture that does develop quicker than anything else I have tried. The fit/size offers the perfect balance is field of view and comfort. I really like the lens changing system. Simple and effective. If you are thinking about these goggles, buy them. You won't be disappointed.