Well, for what it's worth. So far I am very happy with the DumboRC. I planned to add expo but realized that this really is not necessary as all I need is a simple steering wheel radio to work with my 1/24 crawler. The upgrade from 4 to to 6 channels were easy enough and I also added a 3-way switch to enable CH 6 to alternatively be used as a ON/OFF switch (in my case to enable/disable power to my FPV system). I also modified the RX to enable a more low-profile use case (90 deg connector and a slim 3D printed case). Attached is few pics ....