Haven't been for years after going a lot in my sportsbike days, 9:41 is about as quick as I got and that was on my mille R so it's certainly a good effort on a GS.
Interesting article in this months RiDE magazine about the ring and insurance. Some bloke had written in asking if it was legal for his insurance to exclude the ring by name as lots of insurance policies do these days, either that or they exclude "unidirectional toll roads".
The answer was that of course it was legal, an insurer can place any conditions they like as long as they include them in the small print which we all read, don't we!!
More worrying was the legal bods opinion that as it has the status of a public road then you are effectively riding without insurance. Meaning you could be prosecuted for this in Germany, potentially have the bike seized and if found to have caused an accident be personally liable, effectively they could come after your house, pension and any other assets you had.
Obviously all unlikely but it could be disastrous for somebody.
This is very much a precis of the comment but worth a read next time you are standing in a supermarket.