Arborist chips are in high demand around here. I love them and struggle to get
enough for my purposes (I've imported around 50 yards so far). Innoculate with edible
mushrooms if they are fresh (for example King Stropharia). Everyone uses them if they can. We have to pester, bribe, and protect our sources. One arborist has been stockpiling and selling at prices competitive with sifted bark mulch. With biofuel soon all
carbon sources will be competitive. I don't use them in a tillage system or where non-fungal species are nitrogen dependant (mustard and spinich families). Some worry about transfering pathenogenic fungi (laminated
root rot in Doug Fir for example), but I have found no evidence either way.