I had the exact opposite experience with them, and cancelled my card. I returned something, and the company didn't credit the return. I rarely return things,

I had the exact opposite experience with them, and cancelled my card. I returned something, and the company didn't credit the return. I rarely return things, and this was the only return I had ever had with amex. Amex asked if I had contacted the company, and I did, but following up was slow and involved tracing the package and verifying the signature. In the end the company didn't resolve it. So then I contacted american express again and they did not process a chargeback. They said it took too long, even though I had done as they asked. I was really fed up with it, and disappointed because I thought they were different. So I could not in good conscience continue with them and cancelled my card. (I've actually had lots more positive results from visa before and since)