Has anyone taken a look at these products yet? http://www.lawnsite.com/forumdisplay.php?f=214 I had coffee with Don Walker the other morning. He explained to me why he thinks (I agree) his products are better than Add-A-Zone or Doubler and gave me some literature that I found time to review more thoroughly last night. Seem to be good products with good contractor pricing. He offers more discount for one-of samples. The trouble with waiting for a problem to order one is that most distributors aren't going to have these on the shelf. So, I'll order a couple to try them. I'd like to hear opinions from tough judges like Fimco, ML, Boots, Kiril, etc... The Irrigander sponsor forum has some good diagrams and a photo of one of the circuit boards... and explains the products pretty well. Don isn't an aggressive sales guy like some other Lawnsite forum sponsors... he's an electrical engineer who had a problem with his own sprinklers, looked at solutions already on the market, and figured he could do better.