Sorry, but my mate wouldn't pose as a prospective buyer just to try one out. Hard enough to sell a bike privately without having tyre-kickers taking advantage.
That's a possibility as two friends are not long home from doing the Pan American Highway. Although I know I don't let anybody ride my 1200, so I don't see why they would want to let my mate (who is very inexperianced) ride theirs.
What I think is going to happen is that he will just be happy to go for the ordinary 650GS. I think the more road biased bike will be the better choice for him as the above mentioned points of centre stand etc are more suitable for his needs.