I think Bancor is a great buy right now. It's nearly as low in price as it's ever been, and there are several new projects that will use it as their liquidity mechanism, which I don't think is fully factored into the price yet. They are working and partnering with existing local currencies, and predict the emergence of a long tail of millions of complementary currencies. It's something to hold for 5 years.
You'll hear a lot of FUD regarding Bancor, but it's mostly BS. The protocol is already working, the so called "back doors" are temporary, and they plan to be a cross-blockchain protocol, not just Ethereum based. There are incentives to use BNT as reserve. Brilliant team and incredible project.