I recently picked-up a Rachio Gen 2, the experience of which I shared in this video.
One problem I encounter every season is the loss of my irrigation heads. They are literally consumed by my grass. To the point that I have to go on a search and rescue mission in an attempt to locate them and dig them out.
When they are not totally gone, they are blocked by weeds and grass that deflect the water from casting properly. So Rachio solved my water conservation and efficiency problem, but without a mechanical solution to assure my heads pop-up and cast unimpeded, I am no better off.
To that end, I did a little research and believe I found a very nice solution called "Sprinkler Buddy" that I installed and wanted to share with you, my fellow lawn watering efficiency aficionados. I put together a short video that show this sprinkler head dog collar thingy in action. I'm rocking some rachio swag in the video as well (thanks @franz)!
Hope you find it helpful!