The developers of the the highest market share chunk of cryptocurrency camp (Monero) are of the opinion that the maths behind Ethereum is bullshit. I really like the sound of Augur, and it's implication for Ethereum's smartcontracts fulfilled in prediction marketplaces, but with 4 publicly known academic cryptographers incl. a John Hopkins professor saying Ethereum doesn't have the math to back up their claims, I'm not prepared to buy in. On the other hand, Monero, SDK, and the whole money laundering cryptocurreny camp probably is a poor investment at the time of writing given the information I have.