Why is rain water better than well water?
There are many benefits of rain water. Rain water tastes better. It is always lower in sediment which means no need for a softener (and all that salt) and no more crusty appliances scaled from the hard water of the well. Also, more and more frequently, ground water sources are seeing higher levels of contamination from point and non-point source pollution. Check out this KXAN report on the potential dangers of well water.
Finally, rain water harvesting equipment is easily accessed (not several hundred feet underground) which makes repairs and maintenance much easier to perform. Also, because the water is so free of sediment, the equipment is less likely to need repair or maintenance in the first place.