That's the cheaper Chinese Omron switches.
They are complete rubbish for the price point, in a Logitech mouse, as you can't easily swap them out.
Asus are now selling mice with hot swappable switches. I made the (sorry) switch myself after my G903 died, ie I couldn't hold the buttons steady.
I see now that I should be able to source Japanese Omron switches that might be a bit better; the replacement in the G903 requires some patience and (to be developed in my case) skill, but it's not like I can break it any further. Will grab extra spares for my Chakram X at the same time.
Asus are now selling mice with hot swappable switches. I made the (sorry) switch myself after my G903 died, ie I couldn't hold the buttons steady.
I see now that I should be able to source Japanese Omron switches that might be a bit better; the replacement in the G903 requires some patience and (to be developed in my case) skill, but it's not like I can break it any further. Will grab extra spares for my Chakram X at the same time.