Surface
Cougar did not change the top coating compared to the previous Minos models; it is pretty much the same half matte, half glossy surface, which I really do fancy. It feels nice and smooth in the hand, but did not get slippery for me even after several hours of gaming.
Just like the previous Minos mice, the X5 also has rubberized sides. These have a honeycomb-like texture to them, giving the mouse a more grippy feel. The material used is very smooth, and I think it could be a bit rougher to eliminate any kind of accidental slipping.
The back panel is actually detachable, and you can get differently colored replacements from Cougar or even 3D print one yourself. This is a nice addition if you like customizing your peripherals.
Build Quality
No squeaking or creaking sounds come from the mouse, even when I press on the shell very firmly. There is a barely noticeable ratting noise when one shakes the mouse vigorously from the CPI-switcher at the top. After holding it down and shaking the mouse again, the sound disappears. This certainly isn't a thing I would call a problem, though. Tapping the mouse against the mousepad doesn't generate any weird noises either. I have to say that Cougar really did improve their build quality over the years.
Weight
Since the size of the Minos X5 is smaller than its predecessors, it is also a tad lighter, weighing roughly 92 grams (3.25 oz) including a bit of cable. I think this is pretty good and well balanced, but wouldn't mind something even lighter. Thankfully, there is no built-in weight inside.
The mouse did not have its feet attached when I took the picture and weighs only 91 grams because of that.