It's anonymous. But the problem is for example someone try to purchase drugs using bitcoin. This become a new era of transaction without being notice.
The best thing in bitcoin is, I can save it in my own bank, blockchain, and get full control of it. We don't need the teal banks anymore, and don't let them take our money.
The disadvantage IMO, what will happen if internet get shut by some accident or disaster... I think there's no way out to recover our bitcoin once that happen