I was utterly disappointed to get the master mx3 mouse, I've got a perfectly good g900 but as a web developer wanted to use it for testing out responsive designs on my phone and tablet (iOS), the mx keys, nice and easy, hit the button on the keyboard, switches instantly.
The Mouse...umm. I'm sure you are aware of were you put the button to switch the mouse but incase you haven't had every single person who has ever bought this mouse not tell you how annoying it is, being underneath the whole unit, needing to lift it in the air, to then not have 3 buttons but 1 toggle button, even harder to switch. I then thought, well, maybe that's the only spot they can go and given i have both devices hooked into the unifying receiver that i could somehow program it so when i tapped the so convenient, 'easy switch' dedicated keys on the keyboard that it could also switch the mouse to the same device, which may of course be limiting functionality because it would then always switch both, not allowing me to have the mouse on the iPad and the keyboard on the pc or vice versa, something i would be happy live with, with the ability to simply tap a key on the keyboard bringing both keyboard and mouse over to the connected device, it would far outweigh the times i have used them behaving separately on devices but to switch both with the keyboard, i can live with the lesser functionality, in a heart beat. I really hope this is in the 'coming soon' pile of things as i believe it shouldn't have been made available at all without this functionality, or at the least, allow ANY of the auxiliary buttons on the top of the mouse to be able assigned in the logi options to be able to control the 'easy switch' for the mouse, currently it isn't easy.