I recently acquired a free 2006 Dynasty Spa. I replaced both motors (one was seized up) finally got power to the spa and found out the old Balboa VS501Z Spa pack had a short in the circuit board. I contacted SpaDepot and asked them what the direct replacement would be, they told me that the Balboa BP7 5.5kW Spa Control Kit - Up to 2 Pumps + Circ Pump, Upgradable to 3 Pumps would be the replacement. I ordered it online on Monday and received it on Friday. Installation was a breeze, same dimensions as the old spa pack and all of the old plugs for the motors plugged right in. I call for technical support to make sure I plugged the motors int the right slots on the circuit board. Amy took my call and let me know that one of the pumps needed to be plugged into a daughter board in order to function properly, as well as letting me know that the A/V plug needed to have the jumper changed. It has been two weeks now since I installed the replacement spa pack from SpaDepot and I cannot be any happier! Thanks SpaDepot!!