To actually reply to your question: Yes, I have transitioned between the 3" cable operated valve to the electric valve, Valterra to be precise. The difficulty factor is based on where your current valve is located, if there is room to accommodate the sliding action of the valve, and how many valves you want to replace. For my situation, I had easy access to the valve and I had installed a 12 Vdc outlet in the UDC for a previous need. Just recently I somewhat observed a double valve replacement (two bathrooms) on a Landmark and the process was significantly more complex than on my Bighorn because of the tank locations and the drain manifold that also serviced the gray water drainage. I resisted the swap but now really like the new valve and the installation solved the soft, non-sealing, action of the cable valve. I still see no need to replace the gray tank cable valves as they operate efficiently.