After attending Keurig Green Mountain's (GMCR) Keurig Kold launch event, Bernstein says that it has a hard time understanding the device's value proposition and sensed some caution from the company about how quickly the device's penetration will rise and be accretive to earnings. The firm says the device and pods seem a bit expensive, while the brewer and pods are large. The firm believes that the taste of the product's Diet Coke drink was off, although regular Coke and others were good. Coca-Cola (KO) owns a 16% stake in Keurig Green Mountain. SodaStream (SODA) develops and markets at-home cold beverage makers.