I am using a G80-11900 daily and agree on the two swipes under Linux (Ubuntu here) to get from one end of a 720p screen to the other. This is not an issue for me and the supposedly low DPI is actually helpful when doing graphics editing which I do with the touchpad as well.
There is one thing I noticed however: One time it seemed to me as if the physical buttons of the touchpad got stuck, as if something has come between the plastic of the buttons and the microswitches. This only happened once and the issue has not resurfaced yet. I cannot recall though how I solved this, probably shook the keyboard and that was it.
Anyway, overall very happy, I actually like the MX black switches and it's at the moment my preferred keyboard. So yeah, biased.