A lot of interesting comments on this thread. My thoughts below:
Regarding volatility within the crypto-currency, I think you also see currency fluctuations as well. Granted, it seems bitcoin has a much higher beta, but it looks like there are times when the market is relatively stable as well. I can't speak to other crypto-currencies.
To me, the advantages are that the funds transfer almost instantaneously and you avoid the poor exchange rates that banks will often give you. I'd argue that it probably comes out a wash if you do the transaction and then convert to your choice of currency right away.
However, I think there are plenty of upcoming technology that is making international wire-transfers much easier and cheaper. I just used Transferwise for an international purchase (from OmegaForum no less!) and I saved at least a couple hundred dollars in fees. I feel the money transferring business model is ripe for innovation, especially when you see that it's costing people upwards of 4-5% just to move money around.
In short, there are probably some upsides to using crypto-currencies for physical transactions right now. However, I think there are more traditional options that exist which won't expose you to as much volatility. Save the blockchain for other purposes (data verification, financial audits, etc).
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