I got in at the ICO and then got out when the price floor almost vanished. I honestly don't see what's the big deal about bancor. Since the tokens are priced based on the smart contract, it's hard for price to move the way it does from the exchange. Also their instructions to buy BNT are horribly complicated and till they solve that, I see it just going through the steady decline it has.
Don't look Bancor price vs USD. It's 100% completely tied to ETH. In USD terms, it's currently rising because eth is but it's at 0.008243 ETH which is almost the all the time low. The ratio at ico was 0.1 eth by the way.