Hi, I have a Autopilot SIG-220 with an SC-36 cell (also have an alternate SC-48) which is about 4 years old (SC-48 cell has less than 2 years) that is giving me trouble. Even though I'm still doing trouble shooting to see if can identify the issue (Power supply, cell, cable, etc; had another post on this) am considering buying a new unit. I was looking for data on other units and the Hayward Aqua Rite Pro and the Zodiac Aquapure Ei units seems to be good units, but could not find any reviews. If you were to buy a new SWG, among the AutoPilot Digital, Hayward and Zodiac models mentioned above, which one would you recommend and why? My pool is inground, about 15k gallons and runs 6 hours a day with a variable speed drive 2 hp Pentair pump.