I never face any issue in polo while withdrawing fund. I am using polo for years. While there was chatbox in polo, i have seen someone, asking for help. But their percentage was too little, if I remember correctly. May be I am lucky. But I have no doubt that polo is the biggest and far better than Bittrex. They just do not enlist almost every coins, they only allow very selective coins. And Bittrex is also great. But I am now disappointed, what liqui, tidex and allcoin can handle, bittrex are unable to do! . It was unexpected
I think they're just thoroughly testing & reviewing such a critical change (you heard about it I guess), which is good from a security aspect.
In my opinion, this is a plus for trust.