Eyeglasses and razors are two notoriously high-margin personal commodities for which we’ve been overpaying for decades, but two companies have declared war on these monopolistic product lines. Using vastly different marketing strategies, Warby Parker and Dollar Shave Club sell eyeglasses (for men and women) and men’s razors respectively, almost entirely online and via mail-order—at a fraction of the prices we are accustomed to paying (as little as $95 for prescription glasses and three bucks a month for razors). But are they worth it, and what’s the experience like?