Yes, I have friends who also used the Poloniex previously but it just got suck. they try to transfer SBD from Steemit to Poloniex, although the history show it is a successful transfer, but Poloniex just don't reflect the balance. Any it have be outstanding for two days ( I don't know whether they solve this problem at tthis momnet yet). So, I am also considering movr to Bittrex. 

May I have a question is that when I try to transfer SBD to Bittrex, it is also just click on th "+" button and get the address and type in Steemit to transfser, and that's all? Thanks for the post!