Do you mean opinions of ours about crypto currency exchange. I haven't used the IQfinix, but I have used the IQOption, its a good one to use, as it has applications for mobiles, desktops etc. There are a lot of exchanges out there, they differ in their tranx fees, withdrawal fees, KYC and others. A few of them are; gate.io, livecoin.net(currently under maintenance), kucoin.com, binance etc