One of the problems with chippers / shredders is the difficuly in
getting folage in the machine. If you have a bunch of leaves they will
easily go into the machine. But they would also go directly into
compost. If you have long slender branches they are OK as you feed them
into the machine. But if you have brush with lots of small branches it
is more work to get into the machine than it is worth. You need to cut
it into little branches so that they will fit into the opening.

Dick