I ended up trying the Orbit sprinkler and wanted to give my feedback on them.
I installed the Orbit Saturn III on my front yard, which is much smaller than my backyard. For small yards I really like the Orbit sprinkler better than the Rainbird. Here are the things I liked about it:
* Spray pattern on the Orbit is much better for small distances. Instead of being one vertical line of water it sprays it out in a horizontal pattern
* Orbit sprinkler rotates slower than the Rainbird, so together with it's horizontal spray pattern for short distances it gets the grass wetter than the Rainbird without drenching the lawn. I like this because it seems to be enough water to get absorbed in the soil (I have hard-pan here) before it gets wet again, allowing the water to penetrate deeper down which causes the roots to grow further down
* Orbit sprinklers are easier to adjust. I don't need to get out a really skinny flathead screwdriver to adjust it
* Orbit sprinklers advertise a 5 year warranty on the label. I don't know if the Rainbirds have a warranty
* The Rainbird I have in the backyard is leaking after a month of use
* This might be picky, but when it comes to sound, when the Orbit sprinklers are on I just hear the sound of water. When my Rainbird goes on I can here the back & forth sound of a rotating sprinkler
Bottom line? I like the Orbit's for small lawns. I haven't tried using the Orbits for watering at a distance of 20-25 feet, so I can't comment on that. They are about $1 cheaper than the Rainbird sprinklers and advertise a 5 year warranty (again, I don't know if the Rainbirds have a warranty or not) so they seem to be the better option at least as smaller lawns are concerned. I think I might try an Orbit sprinkler on a large lawn, and if I do, I will update this thread.