When researching a replacement for my very old Dolphin robot, I took the excellent advice from many posters to call Margaret at Marine Pool & Spa. She is the real deal, and was very helpful. She hooked me up with the EVO 604. Free shipping, no sales tax, and best price I could find. Plus helping out a family business. Unit arrived promptly, and could not wait to try it out. Well, the power supply was defective and did not work. I called the support number printed on the unit, who then informed me they did not support that model and gave me another number, who said they didn't cover that unit and gave me another number which was the first number. Turns out the company split up the products and haven't figured out who does what. I finally got someone to help and said they would send me a new power supply. Not feeling very confident that I would see anything from the company, I called Margaret to see what they could do. She took care of me, sending me a new power unit immediately. I will update when I actually get to test the unit. 100% postive, 6 out of 5 stars go to Margaret at Marine Pool & Spa.