I have had ours for about 25 years I love it. It is adjustable so you can run it less in the spring and fall and more in the summer. I know in one day if it is malfunctioning.
It doesn't break very often either, I think I have replaced the pump and a few nozzles in 25 years. You do have to know how to close it in the winter if you freeze, it needs to have mineral oil pumped in it for the winter.
Some boarding barns around here charge extra $$ during the summer to pay for the spray.
The best time to plant a tree was 20 years ago, the second best time is today.