Personally I was using Bittrex. But I read and heard that it started to lock/freeze accounts with no reason? Don't know if it is correct and what is the reason behind it, but now I am concerned about this exchange. Luckily, I managed to withdraw my coins with no issues, but some people are struggling with it. I also heard that Kraken has problems with verification. So guys, which exchange do you use?? I see that every exchange has its good and bad, but now when loads of people are trading it is hard to decide which one to use as all of them have some issues..