I have this annoying habit of being indecisive and wanting to get the best value possible, which often hampers my purchase decisions.
I will decide, for example, that I want an iPad case, and then spend hours online researching the best cases and figuring out which one I want to get, before finally purchasing one.
Which is maybe fine for iPad cases and other consumer electronics but it is paralyzing when I'm trying to buy a box of pasta and figuring out which of the dozen brands is offering me the best value, taking into account which brands are currently on sale at any of the 10-15 grocery stores nearby at any given moment... !
I think this particular trait has probably saved me all kinds of grief over the years, in the form of junky electronics that I didn't buy, but at the same time, I can never seem to just "get in, get it, get out" when I go shopping.