Late to the party but here is what I have heard from an executive at our Az Municipal Waterusers Assoc. AMWA. After being out for a few years these soil sensors to this point have not seemed to saved any water. On the contrary they tend to use more water because they are programed for plant health. Optimum plant health and water conservation at least in Phoenix are not consistent objectives. This info was given to me on the side during an event where there was some alcohol involved and was not for the general public info just yet. I have used Acclimas on a varied site with one sensor to cover everything from loose granite to clay back fill with lawn to cacti. It was a pain but after 2-3 months we were able to get it to function OK. On another site we had two homes across the street from each other and one had the Acclima and the other had us setting the controller. We found that in general the Acclima watered a day or two before we would on an established L/S. But we are very actively monitering and adjusting our controllers so once you get the Acclimas set they were a time saver and the plants did not have to endure the stress we put them through by erring on the dry side which is our tendency. It is easier to bring something back from too dry than too wet. Just my .02 I would like to find something cheaper though.