Just spent ages trying to dig up an account with a ggr. Found one eventually!
After a really quick test I found that with the GGR if you break too early you have the time to recharm and then rebreak. This isn't something you can really do with just spell invis.
I also found the ring let me play much more reflexively to react to unexpected circumstances which perhaps I would have been unable to plan for if using an invis spell (on my charmers without ggr I do tend to carry a few cloudy pots as an emergency break, but that is spending 10pp on fixing a single fight).
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