They have many options for amendments I believe. They have super soil, worm castings, lots of gaia green and blue sky products. It's also 10 minutes from my house. I want to look into a worm farm but am worried as the only place I have would get very hot. I have had a wrm farm before years ago in new Brunswick but totally different climate to the sun I get in Alberta.
No expert here, but I've had a worm bin in my closet for the past couple years. No smell or bug problem whatsoever. Cost is minimal, just a few totes with some holes drilled in it and then just the price for some worms and peat/coco coir/compost as a media and its good to go pretty much.
I have only done a few grows, first one using bottled nutes and the other two I used ROLS. The two done in homemade soil with the castings from my bin, went pretty flawlessly with almost no attention other than watering. I attribute it to the quality ewc I had at hand. I still use the same soil growing other things right now with ease. Just throwing this out there as I think your compost input is the heart and soul of your soil moving forward, so a few bucks and a little time could make the difference having your own worm bin. Again no expert, just throwing out there my amateur experiences so far with organic soils.