Maybe at the beginning needed some time and attention to learn in which way is used but for the rest none. So is the same like the other money. As for the fact that is not used widely this maybe come from the fact that is not official money. I do not see any important disadvantage of bitcoin. Although the transaction time is litle bit long, but the transaction is world widely. Bitcoin transaction still faster than bank transfer that costly and difficult for transferring money in different bank.