Surface
As far as I am concerned, the Gladius II Origin features the same materials as its previous iterations. The top part has a slightly sparkly dark gray coating. It is smooth, and I would say it feels half glossy, half matte. It's not rubberized and doesn't feel like a matte UV coating, but it is not the usual glossy finish. Does it feel nice? For sure. I have quite sweaty hands, and some mice tend to slip off my palms after some hours of gaming, but such was not the case with this specific model. A plus note is that it doesn't collect fingerprints at all, unlike a lot of other mice with a similar coating.
The side panels are rubberized and have a Mayan-inspired design. These feel nice and ensure that you won't lose your grip in an intense situation. They seem to be made out of a durable material as well.
Build Quality
My expectations are quite high when I see a price tag like the Gladius II Origin's. There are two slightly negative things I could find. The first is that the scroll wheel can rattle if I shake the mouse, which it did not when I simply swiped it across the mousepad; I really needed to shake it in my hand. The second is that the rear side button is loose in its socket, which results in a bit of noise if I tap the mouse even only slightly against the mousepad (which I tend to do a lot because I play on a low sensitivity and need to lift the mouse up to then put it down again). I am not going to say I am disappointed, but this aspect could be slightly improved upon. Everything else is perfectly fine—the shell did not creak or squeak at all when I pressed on it really hard, and I didn't come across any other issues.
Weight
Even though the Gladius II Origin is a large mouse, I do not like how heavy it is. It weighs roughly 114 grams with a few centimeters of cable (109 g without the cable attached), and there is no built-in weight inside. In my opinion, it could be a bit lighter, but of course, weight is again a personal preference. Generally, the lower the weight, the happier your wrist, and this is a thing I personally realized after switching from a heavier to a lighter mouse over the long term.