The PRO Wireless has a surface I find rather interesting because it's absolutely plain. The same plain matte coating is used across the whole surface of the mouse (except for the glossy bottom plate). This coating is very smooth to the touch, and I find it to be perfectly comfortable and sleek-looking. However, after long sessions of gaming, the palm area got wet, and it made the mouse a tad slippery. This may not happen to everyone, but it's summer here, my apartment is hot, and my palms are sweaty (thankfully, my knees aren't weak, and my arms aren't heavy either).
There is no rubberization on either side, which is a thing I welcome. Lately, I have tested quite a few mice that had some kind of a rubber-coating on the sides, but most of the times, these coatings didn't do their jobs too well. I would prefer the side coating of the PRO to be identical to the one used on the G403 and G703 models, though, as I found those particularly amazing. All in all, the surface of the mouse is smooth and generally good, but with extra sweaty hands, you might have to get a cleaning cloth ready for a longer gaming session.
Build Quality
No squeaks, no creaks, no rattling, no misaligned feet, no unnecessary button travel—the build quality of the PRO is a solid 10/10. There's nothing else to add to it.
Weight
As for the weight, it is truly amazing what Logitech achieved here. A mouse with these dimensions rarely is just a mere 80 grams without a battery, while the PRO actually has one built in. The walls of this mouse are only 1 mm thick, but there is an exoskeleton-designed interior that makes it absolutely solid. The PRO is exceptional when it comes to being lightweight, that is for sure. People have different needs and preferences; as such, not everyone likes light mice. However, over the long run, your wrists will thank you for using something lighter (based on many people's experiences, including my own).