Love the I/O's. Interchangable lenses make them perfect for every day no matter what the conditions. AK skiing means I mostly use the flat light lens but both lenses that come with the goggles are super clear and do their jobs well. Scratches exist, but aren't noticable when using the goggles after 1 season of heavy use. Only problem is that with a Smith Holt helmet you almost always have a bit of a gap since the foam padding extends above the lense. Otherwise couldn't be happier with them.