Definitely a mouse I might try, but my current G400 is still the best imho as it's just a newer MX518 <3 No need for an upgrade or replacement yet, which is what I'd rather call it.
With mice and keyboards it's always just a question of what you're being used to and like. There is no real "this is good, this is bad" if you ask me.
But you're certainly right that pretty much anyone has ever owned a Logitech peripheral Even if it was just one of those old speaker systems
I can definitely say that I'm a fan and will always be one, after owning 3 G35 headsets, Media Keyboard Elite, G910 keyboard, MX518 and G400 mice, C720 webcam and testing the G633 headset