For example, most of their consumer-focused Bluetooth peripherals are great (such as the K380 keyboard).
I thought it was broken - the mouse turns the sensor off if you stop using it for a few seconds, leading to noticeable delays when you start using it again. And the polling rate is so low that it seems to skip some movements, like the old mice with the physical ball you had to clean.
I also had one of the first Logitech "Laser" mice which was unable to track consistently on any surface, worse than the optical mice it was supposed to replace.
Only downside is you have to turn all the RGB lights crap off on the G203.
There isn’t much competition, and only recently are we seeing other companies like Elgato compete with Logitech’s peripherals.
Now that I'm considering it, though, this is easily the nicest scroll wheel I've ever used.