I took it as an upgrade for the wired version, which is already 5 years old. Strong differences are not visible. The wireless version is slightly, barely noticeable, lighter than the wired version (both fully mounted). The new mouse glides a little worse than the old one, but I think it will still get used, and even now it is noticeable only in comparison. I tried the mouse from the sofa - it works fine on the fabric surface. The sleep of the mouse is very sensitive - it can be used instantly, although in my experience, the device usually needs to be clicked / pushed.