I've been buying my glasses from Zenni for a couple years now. I'm rather nearsighted (-7), with astigmatism, so I was pleasantly surprised that the optical quality is pretty good. The frames are somewhat less consistent though, I imagine they have multiple suppliers.

The part I like best about Zenni is the oleophobic hard AR coating option. It doesn't cost an arm and a leg, and actually lasts a fairly long time without scratching. (If you wear glasses you know that no matter how carefully you clean your glasses, they scratch. And the expensive coatings flake off.) Now I clean my glasses with soap and warm water in the morning, and the water just shakes off at the end. The anti-reflective aspect is somewhat lacking, but the ease of cleaning is what makes it for me.

One pair I got at zenni for $6.96 is the best pair of prescription glasses I've ever owned... it's inconceivable to me how it can be that cheap.

Second this. I bought a 30-40 USD prescription lenses that has gotten me more compliments than my 200 pairs ever did. Plus there is no gaudy brand name / logo on them - it is exactly the style that fits me.

And that's including shipping and all the fancy oleophobic anti-reflective coating options.