Just note, in v8 the quality strings have changed. Disabled becomes Bad_Disabled
Also, IA have always recommended against using magic strings to compare quality, as you can see, they may be changed in future versions. Although there's no alternative at the moment in the expression language if you want to check for a specific quality. isGood({[default]path/to/tag}) should work, stealing Jordan's tag path from his post. Note: don't include the ".Quality" on the end, as the quality when reading the quality of a tag itself will always be good