CEX.IO is very good exchange. You can trust them. Sometimes they are slow, sometimes thay are very quick, If they slow you need to wait for deposits and withrowals too. it's sometimes good sometimes bad. For instance i told my last 2-2 withrowals and deposits. The credit card withrowal arrive after just 1 day but it in the home page it seemed it completed inmediately. (It's usual also they write that its 1-3 days) Bank tranfer withrowal told it will arrive 60 days but arrived after 10 days. First deposit done after 6 days second deposit done after 50 days. They need to upgrade id verifications, as well as the support. BUT IT IS A VERY GOOD EXCHANGE! With mastercard and visa, and high liquidity - just think about the price - dec. 20k usd - one btc - everybody sold their btc because everybody know that the real price of btc could be 20k in the end of 2018 if the market news are not full bad news.

@cryptographic