I've been using bittrex for 6 months now and I can only speak good things about them. Reliable, fast tx's ( deposits-withdrawals), easy to use, no trollbox :-), lots of coins, nice volume and overall a perfect experience. I signed up on Polo just for Siacoin and felt pretty lost, much slower than bittrex, withdrawal took hours to be processed plus there were many users complaining about all kinds of stuff happening. Shortly after bittrex added Siacoin, making it the perfect exchange for me. ETH fees cheaper too? Give bittrex a chance if you haven't...Good post!