Existing research and widespread commercial usage suggest that appeals urging consumers to imagine the product experience have powerful effects on product preferences. Three studies examined the mediating role of imagery accessibility and demonstrated that the difficulty of imagery generation can reverse the generally observed positive effects of imagery appeals. When participants were low in imagery abilities or when the product was not presented in a vivid way, imagery appeals were not only ineffective but even had a negative effect on product preferences. Providing evidence for its subjective nature, this imagery fluency effect was more likely for individuals attuned to their internal experiences.