I looked for a root feeder for several weeks and this one that I bought on Amazon is the best!  Both in structure and price.  Easy to use and has saved my trees during the horrible drought we are having in Texas.  It is sturdy and well made and I believe it will last for a long time.  BUT I was wrong!  It soon developed leaks and now it spurts from just about everywhere when I use it.  Very disappointed with that it did NOT hold up well.