Pick your poison I guess. Skimming Shapeshift's T&Cs, it seems their maximum liability to you is $50. So if you want to convert 1BTC to ETH (for example) and something goes wrong at Shapeshift's end and they don't transmit ETH back to you, the best you can hope for out of them is $50. They also put you on the hook for uncapped admin fees at their discretion.

Finally, there's no company info in their T&Cs (just a vague mention that they are incorporated in Zug, Switzerland).

So... all dandy when it works. Pretty scary if shit goes wrong and you were doing a largish trade at the time.

Edit: I have no affiliation with Evercoin or Shapeshift (learnt about both in this thread)