I have the Givi 46 on my FJR. I recently added a 3 piece hardcase system from Kappa (subsidiary of Givi) to my FZ6.
Eventhough Kappa is said to be Givi's "economy" line, I am prefering all 3 bags on my FZ6 to the bags on the FJR.
Way, way lighter, just as waterproof, roomier interior for same exterior dimension(s).
Having 2 keys in my pocket, instead of 1, is a minor issue, as they are color designated, so I always know which key is which. And speaking of locks............the Kappa latching/locking system is way more user friendly. Way more...did I say "way"? J'es sayin'
Ok, my point............and I know you are waiting for it.
Make a list of what your needs are, including asthetics and shop with that in mind. The pricier the case doesn't mean you get a superior functioning product, IMHO.
I'll likely park the Givi 46 as a topcase on the feej and just swap the Kappa back and forth.
(oh yeah, it mounts on the same topcase rack as the Givi. It's the same rack, just a diff name stamped on the side
, and less expensive)
PS. I think part of the reason I spent more time on the 6 this summer was the much lighter luggage. I wasn't lugging 30lbs+ of luggage, PLUS my contents every night. And that 48 ltr topcase swallows everything an impatient, access minded female can throw at it.