I have been all-in on Logitech keyboards and mice for years now. In the beginning it was just the unifying receiver but they've recently switched over to the Bolt receiver. Unfortunately the Bolt receiver is not backwards compatible with devices made for the unifying receiver.

You can pair a single device to multiple receivers and the "switch" button on each device will let you cycle between each receiver. I use the same keyboard and mouse with both my personal computer and my work computer. Every time I need to switch, I just need to use the device switch button on the keyboard and the mouse.