Assuming BTC becomes a generic unit of exchange, the currency promises to save me around $50 to $100 per international money wire and cut the time it takes to transfer funds down to a few minutes. I've had zero failures using the system to date (max transfer time of 20 min), and would need to see a 10% failure rate before it stopped making sense. And that's without even calculating the costs of relying on monopolistic intermediaries like banks for currency exchange.