I would never buy glasses from a store again unless the prices were competitive with the online prices. That said, I've bought lots (>5) of terrible glasses online. Plastic ones break, sometimes the fit is bad, sometimes the lenses are very distorted especially with my prescription, or they're just plain ugly once you put them on. But the price can't be beat so I eat the lemons. Contact lenses are much more reliable since you can buy the exact same product, though last I heard price fixing was being enforced.