Has anyone traded these gold backed coins on spot and derivative market before? Are they worth it?
They are just like any coins/tokens in the crypto exchange. If you know how to trade, then well and good.
Crypto exchanges also make it easier for one to have a feel of what it looks like to trade tokens that represent the actual gold price minus having to go through the hassle of using a broker which may need a lot of KYC documentation and perhaps also limit the trading to only institutional traders or people with lots of money.