You should absolutely do it, Mike! I was only saying to Frau Panzer yesterday that you would love it. They have various bike choices (BMW) including the 1250RLooks fabulous PZ and I'm so envious it's not funny. Enjoy M8 and you'll probably want to trade in your old banger LC on a GS when you get back.
Having ridden the GS for five days now, I truly get why it is so popular, even for those who never take a gravel road. It is the supreme Alpine express, the Telelever readily soaking up the inevitable road irregularities, while still providing enough feel in the front to attack corners with gusto. I’ve occasionally been using all the tread on the confidence inspiring Tourance Nexxt tyres. Erwin Martin’s 17” front wheel conversion makes a lot of sense for those who don’t go off road.
I’ve even become a fan of the Keyless Ride. Yes, it’s true!! On this type of trip, where you’re getting off the bike frequently to look at sights, it’s great to be able to simply press the on/off button, walk away, then walk up to the bike and press the button again. No pocketing the key, then pulling it out again.
The Roadster might be a better carver, but when riding into unknown unknowns, the extra flickability isn’t utilised. And it already comes with a decent screen, rather than spend your ownership optimising air flow on your Roadster, and the ergos are roomy. I’m not about to divorce the Panzer, but if a truck happened to back over it, I may well be tempted to defect - my legs are long enough to comfortably handle it (just) …