Hi, I currently own one AE5 + two PA3 (connected via Aquabus all'AE5) that control two pumps LAING DCC. Now I am going to replace the AE5 with AE6 and pumps DCC with D5. I want to know whether it is worth buying the D5 with rpm control and connect as the DCC or the D5 USB / Aquabus and remove the two PA3. Thanks so much.
D5 pumps don't respond super well to voltage control. If you are buying new pumps anyway and have an aquaero then the USB's are the ones to have. No headers are taken up and you have full control of them.
Whether it is worth it is completely up to you though.