David
Potential buyers who are committed to (trapped in?) the Apple ecosystem need to be aware of the Bluetooth problems of incompatibility and non-operability for this Logitech device. (And presumably for similar Logitech devices that rely on BT LE / 4.0 / Smart). 1. Regarding compatibility, users / buyers need to be aware that this device, the M720, relies on BT LE / 4.0 / Smart (all three labels seem to refer to the same BT protocol) in order to work over BT. So, the multi-device M720 mouse will not work with laptops or desktops that are, generally speaking, more than a couple of years old. If you are contemplating this device for compatibility with an older Mac that uses BT 3.0, you will likely find that your older Mac and this mouse will not communicate via BT. (Though, yes, they will probably work thru the M720s included USB dongle / receiver. To check your machines BT specs, go to About this Mac > System Report > Hardware > Bluetooth. IF your Macs BT is not "yes" for low energy (LE) capabilities, then its not BT 4.0 / Smart.) 2. Worse, regarding operability, the modern Logitech BT devices... maybe modern BT devices from all vendors / brands.... do not seem to work properly or reliably even with the newest Macs and OS X from Apple (as of Dec. 2018). Certainly in my own case, my new M720 does not work properly with my new Mac Mini 2018 running the latest version of OS X Mojave: Upon startup or restart, the Mac fails to recognize the M720 over BT, necessitating that I initiate login with a *separate* mouse that uses the legacy BT 3.0 protocol (alternatively, I resort to the USB dongle / receiver for the M720). For an all-new setup, this behavior is very far indeed from the "it just works" proposition and expectation in the Apple ecosystem. On Amazon and on other sites across the Web, users besides me do seem to be experiencing the same problem: The BT 4.0 connectivity is flaky and unreliable for accessories. I myself have resorted to using the USB receiver for the M720 mouse, given that Ive already paid for the blasted thing, but the whole point of buying the M720 instead of other, cheaper devices was to use BT and 1) enjoy the multi-device control and 2) avoid the dongle / receiver setup. Interestingly, the Logitech K380 keyboard, which seemingly employs the legacy BT 3.0 protocol, does not exhibit the same BT issues as the M720 mouse (though upon startup or wakeup, the keyboard is more laggy than expected or convenient). Ditto a legacy BT 3.0 Logitech mouse of mine. This suggests that the BT issues with reliability and operability are specific to BT LE / 4.0 / Smart. (Neither re-creating the relevant plist file nor disabling Handoff helps. The former is the "solution" from Logitech. The latter is a much-cited hack on the Web.) So, if you are committed to the Apple ecosystem, and BT connectivity with multi-device control is a key reason for considering this mouse, do be aware of your potential (certain?) disappointment. My reading across the Web suggests that I am not alone in encountering these issues and finding no elegant / proper solutions for proper BT behavior. If this community has found a solution... if Apple or Logitech release a fix... please do share. Otherwise: Apple buyers beware!