I think this is close to what I wrote elsewhere: the local mix is a good one in theory, but if any dogs (or cats) are likely to investigate your Square Foot Gardening beds, think again about using something with cocoa bean hulls in it.
Cocoa bean hulls smell like chocolate, and they have sufficient amounts of theobromine in them to poison dogs. I don't have a direct link to the source, but Alpha Pet Supply, in Albany, has a flyer with info on dogs dying *every year* b/c of cocoa bean hulls used as mulch and ingredients in mixes. Even the bags of 100% hulls DO NOT LABEL for the toxicity.
Dogs, being omnivores, will likely investigate/consume the planting mix in an effort to find out what's in it. Cats are less likely to go after it, but may ingest some if they sun themselves or lie down and then groom themselves and ingest it that way.
Since I was yet to be educated about peat moss, I believed Mel and used it in Raised Bed #1. What a mistake! Don't do it!
The coconut coir will be much better in every possible way: environmentally, frustration-wise, and plant-friendliness. (Rants available elsewhere on THG.
American Soil & Rock, on Jacuzzi Street near I-80 and Central, has a good planting mix. I don't know whether it contains cocoa bean hulls, though....and I absolutely *love* their grape-pomace compost; I used it in all five of my SFGs/raised beds in 2008!
Sunset Zone 17, USDA Zone 9