I've picked up a pair of these goggles for a good deal. The lenses switch out quite easily. Actually mounting the lens is easier than removing it, which I didn't find the case to be with my Smith I/O goggles. What i like more than the ease of changing the lens, are the lenses themselves. The Red Ice and Red Solex are perfect for riding in the PNW. Much nicer than the lenses that came with my Smith's. On the downside, one of the magnets came off of one of the lenses, so I'm going to have to take care of that. The lens still stays mounted to the frame. I'm not sure if it cause any other problems.