Honestly, Okchanger.com is not an exchanger. It is actually an exchanger monitoring platform. "Exchanger monitor OKchanger helps find favorable e-currency exchange rates on the best digital money exchangers."
So, if you want to do exchange, I recommend an automatic exchanger for you. I had 20+ transatcions on
http://www.epay.com. They offer Perfect Money, AdvCash... Hope to help you!
Exactly like you said, it's a Monitor/Info site and not an exchanger.
I will agree also and for EPay. I have done some transactions and everything looks good and fast.