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That box caught my eye too, very nice looking on the bike. Being you brought it up, is their mounting plate installed on top of the FJR's stock rack? Just asking and you might have come across this in your research but one weakness the FJR sorta has is in the way the tail section is designed. There has been enough cracked subframes from either overloading or flexing (or both) that several 'fixes' have been developed over the years. One of these is to better support the rear's leverage which the Givi rack you mentioned accomplishes. Same goes for Yamaha's HD replacement rack used with their 50L box and yet another was use of a 'stiffy kit' (search that out). Not saying this is something you need to run out and address right away but maybe something to look into when you've got some time.