I need a new split keyboard and thought I should go cordless this time. I have a choice between the Logitech cordless comfort duo split keyboard (with mouse) and the Microsoft wireless optical desktop pro cordless (with mouse). I already know about the wireless mice. But, neither of the keyboards are in stock anywhere local for me to test their "feel" or responsiveness. Does anyone out there have either of these cordless split keyboards who can make a comment about them? Looking for help here.