Dish considers the converter crucial for good performance of the switch. So, what's to wonder about? Please use it. I can say that once I did disconnect the power converter to make some adjustments, but my switch was still powered. Then a few weeks later, I disconnected the converter again to make a few adjustments. That time there was no power supplied and all pictures were lost. Go figure! So, let's not try to second-guess the Echostar (or Channel Master?) engineers. The instructions say to use it, so I use it.