I had a dispute with BTCInvest / btcinvestapp.net 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: Helpful community forum|Stable platform|Segregated accounts|Good analytical tools
Cons: Some tools only available on higher tiers