Being that I am from Oregon where it rains sparatically, we always offer a rain sensor as an option (upgrade) with every system we install. We had been using the Hunter mini-click for years but that doesn't work real well with the Rainbird ESP Controllers that we prefer to use. You have to jerry-rig the wiring, which is a little complex and not clean IMO. So recently we began using Rainbird's version of the mini-click. They sell one (I forget the name) that's pretty inexpensive (e.g. under $20 my cost) and it hooks right into the rain sensor screws inside the ESP Controller. So that has been working more smoothly. Well, recently, I saw an ad for the Orbit Wireless rain / freeze sensor (Orbit Irrigation - model 57271). Seems like a dream. I love the fact that it's wireless (saves tons of labor) and is pretty affordable (sells for $39.00). And I also love the handy gutter clip it has. Just easily attached to any gutter. It would install in literally 5 minutes. I start seeing $$$$ signs!!! Finally, Orbit tells me I can plug this sensor directly into the ESP controller screws for a rain sensor. No jerry-rigging the wiring. But I am not sure Orbit is the way to go. My experience with Orbit is low-quality homeowner crap. Not professional grade. Although they do put a 7 year warranty on it, which I like. Anyway, what I really want is a good, wireless rain sensor with gutter clip that is fairly inexpensive (under $50) that plugs right into an ESP controller. The rainbird rain sensors are too expensive. Anyone have any good recomendations? Should I try the Orbit?