The fact that buyers want bells and whistles but users want something clear and simple creates a peculiar problem for companies. A product that doesn¡¯t have enough features may fail to catch our eye in the store. (A cell phone that doesn¡¯t offer a Bluetooth connection, for instance, may be dismissed as underpowered, even though relatively few Americans use Bluetooth headsets.) But a product with too many features is likely to annoy consumers and generate bad word of mouth, as BMW¡¯s original iDrive system did. Intended to give drivers unprecedented control over navigation, temperature, and entertainment through a single device, it was so hard to use that it has been described as ¡°arguably the biggest corporate disaster¡± since New Coke.