Cex.io came into the crypto market in 2013. The exchange comes from united kingdom. It has a good mindset for it users. The exchange gives room for fast and simple trading activities. I guess this is as a result of the mobile application the exchange came with. The fee charges should be at least reduced a bit, the trading fee was not too okay by me especially the withdrawal fee. The support teams are very responsible, they give fast response to users messages. I checked for the telegram group, it has many members on the group and the admin advise users strictly to be careful and avoid been scammed. He mentioned that no admin will message you first.