Avoid. Full stop.
Avoid. They take your money, then cancel, then do not refund. They work through disreputable online agents such as Opodo and Edreams -- which in fact are the same company. The fraud is this: you book a return flight from London Gatwick to Shanghai 4 months ahead of your holiday; then 2 weeks before your holiday they cancel just your outward bound flight but not your return flight. They do not do refunds. They partner with companies like Opodo and Edreams, provide no customer service alternative, phone or email. In the end you have to claw the money back through your credit card provider. Its what you should expect from a Chinese parastatal company.