I test drove one here in JHB 10-15min hooligan ride on road tyres (owner was not impressed with dirty dusty bike) and I was seriously impressed with how refined it feels. Suspension is amazing and its got every clicker setting + preload adjustment a dirt bike has but with the click of a button. I did not bond with the 1290 and it was a purchase based on all the hype. But comparing the Multi to the GS the main difference is when you standing on the bike. GS inertia and low center of gravity has its benefits but the weight is seriously far forward on the bike whereas the Multi you can stand and pop the front at low speed almost dirt bike like if that makes sense.
Reason for switching back to something more road orientated was due to the fact that I like to go away for a weekend with the MRS on the back. Meaning pack space and road comfort is higher on my priority list than having a superdirtbike.