G Hub doesn't work with my old trusty G11 keyboard either. Since it's both required for Logitech's newer peripherals and also requires uninstalling the old Logitech Gaming Software which would reduce the functionality of my keyboard, it effectively banishes any future consideration for Logitech's peripherals.
It's basically moot since I run Linux now, but I don't fancy the quality of Logitech's products either these days. It's a shame since their stuff used to be really solid. My X540 speakers are as old as my keyboard (16 years) and also refuse to die.