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I have the RSS on my 991 GT3 and love it. Also, had the RSS on my 997.2 GT3; an awesome sound. Am going to put it on my .2 hen it arrives early next month.
I went with the RSS. My buddy had the GMG, but I preferred the sound of the RSS. It was a more raspy higher pitched howl versus the GMG V8ish (to me) sound Only had it on my .2 GT3 for 1000 miles before I traded the car for a new 18 turbo. It is for sale if anyone is interested. Black, like new condition. $700.