I had a dispute with QE INV (qe-inv.com) 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: Tax reports included|No hidden fees
Cons: Some tools only available on higher tiers|Would like more payment methods