I'm shopping around for witnesses to vote for and you're definitely getting my vote. Excellent write-up.

I personally have not used Poloniex and this is just dumb luck on my part as a newbie. I have accounts on Kraken, Coinbase, and Bittrex currently. I never really hold anything on CB though, it's just what I use to fund my other two accounts.

I like using Blocktrades to send STEEM to my account which I've done at least half a dozen times in the past 3 weeks because the currency has been at such a bargain price. I like Bittrex too and am glad to hear that people who actually know what they're doing think it's a good exchange.