It is frustrating that Options+ can't check for and update firmware when I have two Logitech dongles plugged in at the same time. I don't have a reasonable choice other than having both, as one's in the living room via powered USB hub, and the other is directly plugged into the computer case, and I don't use Bluetooth except when absolutely necessary - I get better performance with the dongles. The fact that I can't even be told if there are firmware updates unless I unplug one of the two dongles, is another frustration.