Erkennt man relativ gut, siehe https://imgur.com/52JlWpr

The mouse mat is not waterproof. It is made of plastic and has a rubber coating on the underside, which makes it non-slip but does not make it waterproof.

If you compare the two, you will see that this one: L:400 mm W:900 mm H:3 mm has. And the one you have attached in the link has: L:435.4 mm W:900 mm H:138.3 mm

The difference is the underside, you can also find both items from other dealers via Toppreise. For 943-000118, the underside is blue: https://superstore.foletti.com/de/products/7080356?vid=toppreise#product-info-tab-desc For 943-000777 the underside is black: https://superstore.foletti.com/de/products/7092170?vid=toppreise#product-info-tab-desc

The Logitech G840 is like the G640, only bigger. You're more likely to find comparisons if you search for them. The Logitech pad is a lot faster than the QCK, especially when new, in terms of both static and dynamic friction. The QCK feels like a "mudpad" compared to a new G640/G840, good for games like CSGO/Valorant but tracking heavy games like Apex or Overwatch are a bit harder. However, since the Logitech has a coating, the pad becomes a lot slower and inconsistent after a while, especially after washing. Generally advise against coated pads unless you want to get a new one every few months or don't play shooters so you don't care about the inconsistent glide.

It depends on the paper and how hard you press on it. Personally, I can't sign anything on it.

This mouse mat is simply super. The mouse glides very well!