Ram, one BIG advantage of a good chiller that hasn't been mentioned is VERY stable temp control. I think all would agree that high temps (83-85) are not nearly as stresful on you inhabitants than large temp swings during the day/night. My system (with Chiler) varies between 79.8 and 80.5 .... 24x7

However, the danger with any "automation" is you can't ignore it. Someday something will go wrong (Blown fuse, pump failure, etc.), so you have to keep an eye on it just like any other equipment, and maintain it regularly.