The reason why I would came out at skeptic is because its proponents are full of shit, political and naive to the extreme and they are against government by default. Alternatively they are cynical businessmen riding with hype.
Proponents can't distinguish different roles of money. They have never heard of basic things like: optimal currency region, connection between balance of payments and exchange rate, smurfing ... They think they have discovered something else than just new payment and transaction method.