I'd sometimes have to remove the dongle and re-insert it for it to be recognised (again) by the OS. When I used it via bluetooth it would keep failing to connect and need manual deletion from the list of paired devices and re-adding.

Also its dongle seemed to interfere with my wireless Apple keyboard. Not sure but it seemed to correlate a few times.

It's much better with its own dongle, yes, but ... I got sick of the occasional issues. No issues with a wired mouse.