A big change from the Honda. Wonder why you need the top box as I think they look so much better without this huge lump on the back? I also saw two bikes like this on fB; looks just like your old and new.
We tend to get detached at lot to other test centres and the top box gives us more room to put all our stuff in. Saves trying to cram it all in the panniers. That said they can be taken off should we decide not to use it.