I've got a Givi after having two Shaqs. The bottom broke out of those. The first one was replaced free of charge, but when the 2nd one broke when I was in Bay St Lawrence, at the very north end of Nova Scotia's Cabot Trail. I held it together with bungee cords until I got to Twisted Throttle's store. (I had bought it from them.) They told me it was overloaded. I replaced it with the Givi, have loaded it just as heavily and it's still fine. I had a Givi on my two '99 Kawasaki Concours. It survived a wreck which totaled Connie #1 and lasted for nearly 160,000 miles of being heavily laden.
The good news for you is that Givi manufactures the Honda top box. I use the top box all the time. I think you'll like it.