I have a 4 stage rodi unit, but my basement isnt plumbed yet for a water drop. Ive never used it, i am kinda concerned about not using it, but the amount of water wasted on these things........ I couldnt imagine my water bill! I am really interested in what your water bill goes to. Please repost on your findings. :-)
The water wasted by the RO is infinitely cheaper than water from your LFS.
I have a 5-stage ($100) and hooked it up to my fridge as well so it makes ice and dispenses water. Saves me $40 filters for my fridge on top of my LFS water savings!