Common knowledge holds that thorough conscious thought leads to good decisions and satisfactory choices. Whether purchasing a new car, a desktop computer, or a pair of shoes, people generally believe that serious conscious deliberation increases the probability that they will make the right choice. This idea applies especially to choices between products that are complex, multifaceted, and expensive. Whereas most people are willing to buy a new set of towels without much thought, they are unlikely to buy a new car or outfit a new kitchen without deliberation.
A second pervasive idea is that the quality of a choice benefits from sleeping on it. Rather than (or in addition to) thinking consciously, people usually feel that unconscious thought is useful for making sound decisions.
Interesting. But since they measured the 'correctness' of the choice being by measuring postchoice satisfaction I think this says more about the nature of regret, and how we might 'beat ourselves up' over a wrong choice than anything else. Perhaps, if you've consciously evaluated criteria for a choice, you are more likely to notice negative reasons why you shouldn't had picked it? I think there's a lot of stuff going on here!
I wonder what would happen if you repeated this with choices where there was objectively a right or wrong answer (rather than subjective).