I had a dispute with Bitantc (bitantc.cc) and went to their complaints process. They have an internal team that just defends the company. Then they said I could go to an ombudsman - but the ombudsman they use is industry-funded and rarely rules for the client. The system is rigged.
Pros: Multi-currency support|Quick verification|Fast support response|Customizable dashboard
Cons: Account statements could be more detailed