My wife nearly jettisoned the smart plugs after 5x attempting to get them all to turn on at once. Worse, sometimes a command will hang, leaving two lights on and the other one just randomly lights up a few minutes later.

The eTekcity 1Tx/5Rx remote outlets running on (I'm pretty certain) 433.92Mhz that these TP-Link smart plugs replaced work every single time. (Going back to those is sounding better, now that I think about it.)