I use it here in the high dessert, and get very good results when considering the environment here (exceedingly bright!)
as a fungus it does require damp ,dark and especially in your area relatively warm conditions. Here, I have a problem meeting the first two
but not the last. I found a good organic mulch laid down thick takes care of that but it also means I can't till the next season if I want to save it for the next veggies in my rotation.
I.M.O. the yields I get are worth the initial cost and being the cheap b#@[email protected]
I am, it's easier to let it over winter and give it something else to bind to next season!
Hope this helps.