Sorry for posting in a commercial forum since I am not in the industry, but you guys are they experts.... I just bought a house in Nov. 2003 with an irrigation system that has a combo of Hunter PGP, Rainbird T-Bird and Toro rotors and Toro sprays. I had my sprinklers turned on by a pro about a month ago. It costed me $190 total. He did backflow test $60 and had to replace two bad Hunter PGP rotors at $29/piece. Now a month later, 2 more rotors stopped turning (Toro this time). Rather than pay him another $75 to come out + $60 to replace these two, I wanted to do this myself. (I'm 27 yr old and broke, i.e. cheapskate now) Should I start replacing bad rotors with one brand? After reading about Toro, I want to use either Hunter or RB. Which one should I use and how do I determine which will match the precip rate of the original design? I believe the design is good since it does use head to head coverage. But then again, it looks like they used whatever they had left over in their trucks and pieced my system together. Any advice would be greatly appreciated. P.S. I have 1/3 acre with 10 zones. I believe it was put in about 4 years ago. The controller is RB ESP-LX. Much Thanks!