From what I've been seeing, the Stroms can go anywhere the GS's can go and do so more reliably. More power, better handling, etc.
When is BMW going to get their bikes straightened out? Seems like they've been in a downward spiral for a number of years. It seems that the price of their bikes keeps going up and their quality and reliability keep going down. They are the only motorcycle company I'm aware of that keeps getting knocked on their reliability, consistently. It's a real shame, they used to be pretty good bikes. Are they trying to take the old boxer twin beyond what that basic design is capable of?