Just installed the GIVI B32NMAL top case on my 2021 Honda ADV 150. Considering this case costs less than $100, I am absolutely thrilled with it. It uses a monolock plate that I was able to attach to my aftermarket luggage rack in about 10 minutes. Once the plate is attached, the case itself can be locked onto the plate or removed from it in 1 second with the simple press of a button. When attached, it's good and secure, and I am impressed with the 32-liter capacity -- easily enough to accommodate a full-face helmet with room to spare, or enough for several pretty large bags of groceries.
I also think the case looks great on my bike, but I guess I am lucky that the black/gray color scheme of the case perfectly matches my scoot. Lock mechanism works smoothly.
This is not a ballistic case by any means in terms of overall durability. It's a molded plastic about what you would expect at this price point, but in no way flimsy. I would anticipate getting many years of service out of this product. I'm going to get some self-adhesive foam padding and affix it to the inside, just to cushion the cargo and prevent vibration/bouncing when riding with a load in there.
Hope others in the market for a top case find this helpful. I looked at other GIVI models, as well as some from Shad, but ultimately settled on this one because I liked the squared off look better than the rounded style on most of the lower-cost cases.