I think it would be great but wife wants cushy (and if possible heated) seat , backrest, etc.
So did mine and she is completely happy on the back of my Multi. Just sayin'.
The top box has a backrest pad built into it.
Heated seat is a simple matter of adding a heated element to the stock seat. The local upholstery shop quoted me like ~75-100 to pull the cover, shave the foam slightly to allow for the heating element and then re-cover it.
In 2 up touring mode with luggage, it is almost too cushy for my tastes but the wife seems to enjoy it.
But then I am not a huge BMW fan. Sure I like the bikes and all but I like them the way you like a government building. It performs its function pretty dang well but it just does nothing for me emotionally. Granted, the HP2 and the S1000RR are exceptions to that rule but...