I broke the frames on my last pair of Smiths on Todd's Murder Van. I sent them back to Smith and got some great customer service. The didn't have replacements but gave me full retail credit to purchase anything else from them.

My wife and I each have a pair of Smiths. Mine are the photochromatic "Guide" model. Hers are slightly smaller and have a lighter-shaded lens. Mine have survived years and my only complaint is that they sit so close to my face that, depending on circumstances, they can fog up. My wife's glasses have actually become my #1 choice because, around here, I think lighter is better than darker in most situations.

I have a set of Maui Jim's that are very nice but only get used on bluebird days due to the darkness of the tint.

I still have a pair of Native's with 2 sets of interchangeable lenses. IMO, they suck. Non-glass lenses that scratched very easily. A horrible value.

Despite my personal experiences, I have to think that the variation within a manufacturer is too great to say something like "Smith's are the best" or "Native's suck". I think there are a lot of great glasses made these days. I also think that the prices on said glasses are absurd.