I have had this remote for approximately one week, and I am already very pleased to confirm that it is fully compatible with Logitech z607. The overall quality and feel of this remote are vastly superior to the remote provided by Logitech with its speakers, particularly since Logitech does not offer replacement of those shitty original remotes that die in less than a year :/
I would like to express my gratitude to Remote-Control for the dedicated work you do in providing us with alternative quality remotes to bad original ones. That's a lesson to Chinese who do the same as you do basically... except Chinese products never work ;)
Have a nice day!