Overall this Bitcoin exchange is merely OK. On the plus side, it is very secure and is quite easy to use. Liquidity is not a problem due to its FOK system, and for many traders this could be a big enough reason to join the Bitcoin exchange.
The issue is of course the huge charges which are often not made clear to customers. They have a rounding error which means they take an extra (tiny) cut and they deduct .02% in transaction fees.
And these customers are quite angry, as CEX seem to be taking bits and pieces out of their clients at every step along the deposit, purchase and withdrawal stage. But they do seem to have improved in recent months and have been clearer about their fee structure.
If you want a secure Bitcoin exchange and don’t want to take any chances, then CEX io might be the way to go. It is the European equivalent of Coinbase but tends to be a lot more expensive and a little more liquid.