I have just purchased a GE Cafe gas range. The user guide indicates:
Do not use a wok on the cooking surface if the wok has a round metal ring that is placed over the burner grate to support the wok. This ring acts as a heat trap, which may damage the burner grate and burner head.
Also, it may cause the burner to work improperly. This may cause a carbon monoxide level above that allowed by current standards, resulting in a health hazard.
However, I have read several times on the web that using a round bottom wok with a wok ring yields optimal results when cooking on a gas range.
What do you think?
Source: Use and Care Manual.