I have heard about them. I tried to create an account with BK8 in the past to check out the site. Unfortunately, they require that you go through KYC verification before you can access it, so I never added them as I wasn't able to check anything. If what Bitinity is saying is still true today, I wont add them to the list yet. But I will take your advice and ask about the minimum requirements in their ANN thread.
Yep, Bitinity is right. I had also avoided the registration process yesterday as they ask for tier 1 KYC during registration. But I have created an account today after watching the reply of Bitinity and found that BTC is available for deposit only, not for the withdrawal. I wouldn't suggest about them here if I was aware of this before.